A general view shows the illuminated Eiffel Tower amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France, January 25, 2023. REUTERS/Gonzalo Fuentes 

Antonela, 11, the niece of Jose Maria Casais's caregiver Alvaro, wishes a merry Christmas to Casais, 69, who uses a nasal cannula connected to a portable oxygen concentrator respiratory machine to breathe, while Casais sits in a wheelchair in his house in Barcelona, Spain, December 22, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Jose Maria Casais, 69, who is suffering from flu, uses an oxygen nebuliser as he sits on a wheelchair inside his house, in Barcelona, Spain, December 22, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Alvaro, 40, a caregiver, helps his client Jose Maria Casais, 69, get into his bed, in Barcelona, Spain December 21, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Alvaro, 40, a caregiver, and his client Jose Maria Casais, 69, talk while cooking in the kitchen, as Casais uses a nasal cannula connected to a portable oxygen concentrator respiratory machine to breathe, in Barcelona, Spain, December 14, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Alvaro, 40, a caregiver, helps to dress his client Jose Maria Casais, 69, who uses a nasal cannula connected to a portable oxygen concentrator respiratory machine to breathe, in Casais's house in Barcelona, Spain, December 14, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Alvaro, 40, a caregiver, pushes the wheelchair of his client Jose Maria Casais, 69, who uses a portable oxygen concentrator backpack with a battery to breathe, as he gives a sandwich to Enrique, who is a homeless, on a street near Casais's house in Barcelona, Spain, December 14, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A medical oxygen cylinder, for usage in case of a power outage, stands next to the wardrobe of Jose Maria Casais, 69, who uses a portable oxygen concentrator respiratory machine to breathe, in Barcelona, Spain, December 14, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Jose Maria Casais, 69, talks with bar worker Gloria while having coffee, as he uses a portable oxygen concentrator backpack with a battery to breathe, in a bar in Barcelona, Spain, December 14, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Alvaro, 40, a caregiver, uses eyedrops for his client Jose Maria Casais, 69, as Casais uses a portable oxygen concentrator respiratory machine connected to electricity to breathe, in Casais's bedroom in Barcelona, Spain, December 11, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Jose Maria Casais, 69, sits on his bed before sleeping, as he uses a nasal cannula connected to a portable oxygen concentrator respiratory machine to breathe, in Barcelona, Spain, December 11, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Jose Maria Casais, 69, uses a portable oxygen concentrator backpack with a battery to breathe, while sitting on a wheelchair in a park next to his house in Barcelona, Spain, December 9, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A photograph of Jose Maria Casais, then aged 35, alongside photographs of his mother, Teresa Naveira Varela, and brother, Emilio, are displayed in his living room, in Barcelona, Spain, December 9, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). For the past two years, Casais has been plugged into the oxygen concentrator for up to 24 hours a day. His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Jose Maria Casais, 69, breathes using a portable oxygen concentrator respiratory machine, which is connected to electricity up to 24 hours a day, as he watches a TV news program about the cost of electricity in Europew while sitting on a wheelchair in his house in Barcelona, Spain, December 9, 2022. Casais, a retired engineer, says he is being forced to raid his savings every month after his energy bills soared because of his reliance on the oxygen machine to alleviate his chronic obstructive pulmonary disease (COPD). His electricity bill has almost tripled since Russia invaded Ukraine in February, he says, triggering an energy crisis in Europe because of its dependence on Russian gas. REUTERS/Nacho Doce SEARCH "DOCE ENERGY CRISIS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A general view of Paris amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes 

A view shows the scaffolding around the Notre-Dame de Paris Cathedral as work continues to rebuild the roof and the spire destroyed by fire, amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes 

A general view shows the Eiffel Tower and vapour that billows from smokestacks in Paris skyline, amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY 

A general view shows the Tours Duo and vapour that billows from smokestacks amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes 

A general view shows vapour that billows from smokestacks in Paris skyline amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes 

A general view of Paris amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes 

A general view shows the Tours Duo and vapour that billows from smokestacks amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY 

A general view shows the Louvre museum and the big wheel at the Tuileries Gardens amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France December 9, 2022. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY 

Christmas lights are viewed from the Galeries Lafayette department store, with the Eiffel Tower in the background, amid an energy crunch, where in public and private buildings people are encouraged to save on their electricity consumption, in Paris, France, December 7, 2022. REUTERS/Benoit Tessier 

A kid rides a bicycle to power a Christmas lights installation in a Budapest district square to save costs with sustainable lights, in Budapest, Hungary, November 28, 2022. REUTERS/Marton Monus 

A kid rides a bicycle to power a Christmas lights installation in a Budapest district square to save costs with sustainable lights, in Budapest, Hungary, November 28, 2022. REUTERS/Marton Monus 

A giant Christmas tree stands at the Galeries Lafayette department store for the Christmas season amid an energy crunch where in public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store, amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A giant Christmas tree stands at the Galeries Lafayette department store for the Christmas season amid an energy crunch where in public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

Shoppers look at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

Shoppers take pictures of the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A giant Christmas tree stands at the Galeries Lafayette department store for the Christmas season amid an energy crunch where public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

Shoppers take photos of the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

Shoppers look at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

A shopper looks at the festive window decorations for the Christmas season at the Galeries Lafayette department store amid an energy crunch wherein public and private buildings are encouraged to save on their electricity consumption, in Paris, France, November 16, 2022. REUTERS/Benoit Tessier 

Fabrizio Cardinali, 72, saves the water he previously used to wash vegetables, at his home in the woods of the small town of Cupramontana, Ancona, Marche, Italy, November 15, 2022. Cardinali, founder of La Tribu delle Noci Sonanti (Tribe of Harmonious Walnuts), has been living alongside nature without gas and electricity for 36 years. "I was not interested in being part of the world as it was going. So I left everything - family, university, friends, the sports team, and set off in a completely different direction," he said. "Giving something up is not masochistic. You give something up to obtain something else that is more important." REUTERS/Yara Nardi SEARCH "NARDI CRISIS ITALY" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A patient receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

A patient receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

People receive hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

A patient receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

A patient, Halyna Halytska, 65, receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

A patient Halyna Halytska, 65, receives a hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

A patient receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY 

A patient, Halyna Halytska, 65, receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

People receives hemodialysis treatment in a hospital as water supplies were cut off as power went off in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

People receive hemodialysis treatment in a hospital as water supplies were cut off due to power outage in the area, as a part of rolling blackouts introduced by the authorities, to save electricity after recent Russian strikes on energy infrastructure, amid Russia's ongoing invasion of Ukraine, in Obukhiv, Ukraine November 9, 2022. REUTERS/Gleb Garanich 

An activist from the "On the Spot" parkour team climbs up a building during on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

Kevin Ha, from the "On the Spot" parkour team answers questions on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

An activist from the "On the Spot" parkour team climbs up a building on a night when they turn off the lights on dozens of storefronts to raise awareness on saving energy and reduce light pollution in Paris, France, October 23, 2022. REUTERS/Benoit Tessier 

German Chancellor Olaf Scholz meets with an employee working in the energy sector before he tours two apartment blocks built to conform with energy saving measures in Munich, Germany, October 22, 2022. REUTERS/Lukas Barth/Pool