A Polish engineer Norbert Lesniewicz is seen during work in an office at ME-LE Biogas company, as the spread of coronavirus disease (COVID-19) continues, in Torgelow, Germany March 30, 2020. Picture taken March 30, 2020. REUTERS/Annegret Hilse

A Polish engineer Norbert Lesniewicz is seen during work in an office at ME-LE Biogas company, as the spread of coronavirus disease (COVID-19) continues, in Torgelow, Germany March 30, 2020. Picture taken March 30, 2020. REUTERS/Annegret Hilse

A Polish engineer Norbert Lesniewicz is seen during work in an office at ME-LE Biogas company, as the spread of coronavirus disease (COVID-19) continues, in Torgelow, Germany March 30, 2020. Picture taken March 30, 2020. REUTERS/Annegret Hilse

The ME-LE logo is seen over the entrance of the main building of ME-LE Biogas company, as the spread of coronavirus disease (COVID-19) continues, in Torgelow, Germany March 30, 2020. Picture taken March 30, 2020. REUTERS/Annegret Hilse

Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. Picture taken October 2, 2019. REUTERS/Mike Blake

Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. Picture taken October 2, 2019. REUTERS/Mike Blake

Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. Picture taken October 2, 2019. REUTERS/Mike Blake

Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. Picture taken October 2, 2019. REUTERS/Mike Blake

Gas cylinders stand in the back of a truck in Ciudad Juarez, Mexico October 5, 2017. The writing on the truck reads "Biogas, clean and reliable energy." Picture taken October 5, 2017. REUTERS/Jose Luis Gonzalez

A car is parked at a service station for electric cars powered by solar energy in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses in front of a biogas generator, in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

A biogas generator is pictured in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

A street sign is pictured close to a water tower of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses in front of a biogas generator in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses next to a wind turbine in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses next to a street sign, in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

A car is seen parked at a service station for electric cars powered by solar energy in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses in front of a service station for electric cars powered by solar energy, in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

A general view shows the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn (R), mayor of Wolpertshausen, and Jochen Breitkreuz visit the biogas generator in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

Juergen Silberzahn, mayor of Wolpertshausen, poses next to a street sign in the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18, 2016. REUTERS/Michaela Rehle

A general view shows the village of Wolpertshausen near Schwaebisch Hall, Germany, March 18, 2016. Wolpertshausen produces up to 30 percent more electricity from renewable sources (biogas generator, wind turbines and solar panels on the roofs) than its 1,300 residents use. Picture taken March 18. REUTERS/Michaela Rehle

Mohammad Zayed carries a bucket of waste to be used in a HomeBioGas portable reactor that turns food leftovers and manure into methane outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Mohammad Zayed fills a bucket with waste to be used in a HomeBioGas portable reactor that turns food leftovers and manure into methane outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Nayef Zayed lights a gas burner running on methane produced in a HomeBioGas portable reactor in his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Nayef Zayed and his son Mohammad prepare to pour waste into a HomeBioGas portable reactor that turns food leftovers and manure into methane outside their home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Nayef Zayed empties a bucket of waste into a HomeBioGas portable reactor that turns food leftovers and manure into methane outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Mohammad Zayed carries a bucket of waste to be used in a HomeBioGas portable reactor that turns food leftovers and manure into methane outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Mohammad Zayed fills a pot with water to be boiled using gas produced in a HomeBioGas portable reactor outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Nayef Zayed empties a bucket of waste into a HomeBioGas portable reactor that turns food leftovers and manure into methane outside his home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Sons of Nayef Zayed stand next to a Home Biogas portable reactor that turns food leftovers and manure to make methane, outside their home in the Palestinian Bedouin village of Ojah, near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

A general view of the Palestinian Bedouin village of Ojah near the West Bank city of Jericho August 17, 2015. Palestinian villagers living in desolate, off-grid areas in the West Bank have begun using Israeli-made biogas generators that supply free, clean energy by gobbling up organic waste. Picture taken August 17, 2015. REUTERS/Ammar Awad

Stephan Martinez, owner of Le Petit Choiseuil bistrot, displays a transparent plastic bag with food waste garbage of his restaurant in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, poses with a garbage container to collect food waste in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, poses with a garbage container to collect food waste in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, displays a transparent plastic bag with food waste garbage of his restaurant in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, poses with a garbage container to collect food waste in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, poses next to food waste garbage in the kitchen of his restaurant in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, poses next to food waste garbage in the kitchen of his restaurant in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, points at a sticker for a pilot project to collect food waste on a garbage container in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Stephan Martinez, owner of Le Petit Choiseuil bistrot, points at a sticker for a pilot project to collect food waste in Paris February 12, 2014. A group of Paris restaurants is turning food scraps into biogas and compost ahead of a new law that will force thousands of French food outlets to recycle their organic waste. Some 80 restaurants, caterers and hotels, signed up for a pilot project to collect their food waste, which is used to generate biogas and produce electricity and heat, as well as compost for farms around Paris. Martinez, who took the initiative for the project, said the collection anticipates the law but that participating restaurants are happy that someone collects their waste and puts it to good use. REUTERS/Charles Platiau (FRANCE - Tags: FOOD ENVIRONMENT SOCIETY ENERGY)

Algae colonies are pictured with a digital camera through a microscope after being collected from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Algae colonies are pictured with a digital camera through a microscope after being collected from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Algae colonies are pictured with a digital camera through a microscope after being collected from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researcher Miled Morad, 33, shows a container with a water sample collected from a tank to see it under a microscope at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researcher Miled Morad, 33, collects a water sample with a container from a tank to see it under a microscope at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project leader and director of innovation and technology Frank Rogalla (back R) points to an informational poster as he talks to researchers at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researchers Mara Laureano (R), 27, and Miled Morad, 33, talk after she collected water samples with Imhoff cones from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researchers Miled Morad (L), 33, and Ignacio de Godos, 30, check the tanks at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researcher Mara Laureano, 27, collects water samples with Imhoff cones from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

Aqualia's All-gas project researcher Mara Laureano, 27, carries two Imhoff cones with water samples from a tank at a waste-water treatment plant in Chiclana de la Frontera, near Cadiz, southern Spain June 6, 2013. The Spanish resort town with sprawling golf courses and tree-lined beaches has added another green site to its attractions: the world's first plant to convert sewage into clean energy. The facility in Chiclana de la Frontera on the southwest tip of Spain uses wastewater and sunlight to produce algae-based biofuel as part of a 12 million euro project to pursue alternative energies and reduce reliance on foreign oil. While industries such as breweries or paper mills have produced biogas from wastewater for their own energy needs, All-gas is the first to grow algae from sewage in a systematic way to produce a net export of bioenergy, including vehicle biofuel. Picture taken June 6, 2013. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS ENERGY ENVIRONMENT SCIENCE TECHNOLOGY)

A cook throws away leftovers in the 'Auf da Muehle' restaurant in the western Austrian village of Soell June 2, 2013. Andreas Koller, the owner of the restaurant, says only about 5-10 percent of all food there is thrown away. The waste food is collected and sent weekly to a biogas plant, where it is used to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 2, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

A biogas pipe is pictured outside a biogas plant in the western Austrian village of Koessen June 4, 2013. Food waste is used at the biogas plant to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 4, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

A bio-waste container stands outside a biogas plant in the western Austrian village of Koessen June 4, 2013. Food waste is used at the biogas plant to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 4, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

Owner of the biogas plant, Josef Fahringer, checks the turbine of the plant in the western Austrian village of Koessen June 4, 2013. Food waste is used at the biogas plant to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 4, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

Workers empty a bio-waste container at a biogas plant in the western Austrian village of Koessen June 4, 2013. Food waste is used at the biogas plant to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 4, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

A waitress carries a dish with steaks in the 'Auf da Muehle' restaurant in the western Austrian village of Soell June 2, 2013. Andreas Koller, the owner of the restaurant, says only about 5-10 percent of all food there is thrown away. The waste food is collected and sent weekly to a biogas plant, where it is used to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 2, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

Leftovers are pictured in the 'Auf da Muehle' restaurant in the western Austrian village of Soell June 2, 2013. Andreas Koller, the owner of the restaurant, says only about 5-10 percent of all food there is thrown away. The waste food is collected and sent weekly to a biogas plant, where it is used to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 2, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)

Leftovers are pictured in the 'Auf da Muehle' restaurant in the western Austrian village of Soell June 2, 2013. Andreas Koller, the owner of the restaurant, says only about 5-10 percent of all food there is thrown away. The waste food is collected and sent weekly to a biogas plant, where it is used to help produce electricity. Cutting the amount of food that goes to waste is the special theme of this year's World Environment Day on June 5. The U.N. Food and Agriculture Organization estimates that about a third of all the food produced for human consumption worldwide every year is wasted. Picture taken June 2, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT FOOD SOCIETY)