Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff speaks during a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff reacts as he attends a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff and German Minister of Food and Agriculture Julia Kloeckner attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff and German Minister of Food and Agriculture Julia Kloeckner attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff and German Minister of Food and Agriculture Julia Kloeckner attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate Prime Minister of Saxony-Anhalt Reiner Haseloff walks to greet German Minister of Food and Agriculture Julia Kloeckner (not pictured) as she arrives to attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate Prime Minister of Saxony-Anhalt Reiner Haseloff and German Minister of Food and Agriculture Julia Kloeckner walk during a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate Prime Minister of Saxony-Anhalt Reiner Haseloff greets German Minister of Food and Agriculture Julia Kloeckner as she arrives to attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

German Minister of Food and Agriculture Julia Kloeckner pets a dog next to Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff, as they attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff holds a shovel during a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff holds a shovel during a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff, and German Minister of Food and Agriculture Julia Kloeckner attend a press event about reforestation before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff looks on during a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff looks on during a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff attends a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff speaks, as he attends a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff attends a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Christian Democratic (CDU) top candidate and Prime Minister of Saxony-Anhalt Reiner Haseloff attends a press event about reforestation with German Minister of Food and Agriculture Julia Kloeckner (not pictured) before the federal elections, in Oranienbaum-Worlitz, Germany, June 2, 2021. REUTERS/Christian Mang

Children walk next to a sand dune during a voluntary tree-planting event organised by their school and the Wang family, on the edge of the Gobi desert, on the outskirts of Wuwei, Gansu province, China, April 16, 2021. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland. Experts say China's reforestation work has become more sophisticated over the years with the government benefiting from decades of experience and able to mobilise thousands of volunteers to plant trees, emulating frontline pioneers like the Wangs. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

People wait for transportation at a bus stop as the city is hit by a sandstorm, in Beijing, China, March 15, 2021. In March, heavy sandstorms hit Beijing for the first time in six years, putting the country's reforestation efforts under scrutiny, with land increasingly scarce and trees no longer able to offset the impact of climate change. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

The Ivorian environmental activist Andy Costa also known as the cycling ambassador in Africa, plants a tree during the "One day five million trees" reforestation day in Yamoussoukro, Ivory Coast July 25, 2020. Picture taken July 25, 2020. REUTERS/Luc Gnago

Ivorian environmental activist Andy Costa also known as the cycling ambassador in Africa, stands in front of a billboard during the "One day five million trees" reforestation day in Yamoussoukro, Ivory Coast July 25, 2020. Picture taken July 25, 2020. REUTERS/Luc Gnago

A man from Guediawaye je m'engage association waters a newly planted tree to reforest the coastline on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

A man from Guediawaye je m'engage association waters a newly planted tree to reforest the coastline on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra

A man from Guediawaye je m'engage association waters a newly planted tree to reforest the coastline on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra

A man from Guediawaye je m'engage association waters a newly planted tree to reforest the coastline on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra

A tree that was newly planted by Guediawaye je m'engage association to reforest the coastline is pictured on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra

A girl carries plant part of an activist initiative to reforest around the divinity mosque in Dakar, Senegal June 19, 2020. Picture taken June 19, 2020. REUTERS/Zohra Bensemra

A man from Guediawaye je m'engage association walks to water newly planted trees to reforest the coastline on the coast of Guediawaye on the outskirts of Dakar, Senegal July 16, 2020. Picture taken July 16,2020. REUTERS/Zohra Bensemra

A boy carries a plant as activist initiative to reforest around the divinity mosque in Dakar, Senegal June 19, 2020. Picture taken June 19, 2020. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

A tree that is about to be planted is seen during a reforestation project in Nova Mutum, Brazil, February 19, 2020. Picture taken February 19, 2020. REUTERS/Alexandre Meneghini

Josafa Santos carries trees to be planted during a reforestation project in Nova Mutum, Brazil, February 19, 2020. Picture taken February 19, 2020. REUTERS/Alexandre Meneghini

Farmers plant trees during a reforestation project in Nova Mutum, Brazil, February 19, 2020. Picture taken February 19, 2020. REUTERS/Alexandre Meneghini

A volunteer collects Brazil nuts in their shells at a seed nursery for a reforestation project in Itapua do Oeste, Brazil, February 18, 2020. Picture taken February 18, 2020. REUTERS/Alexandre Meneghini

Ricardo Souza, 23, works at a seed nursery for a reforestation project in Itapua do Oeste, Brazil, February 18, 2020. Picture taken February 18, 2020. REUTERS/Alexandre Meneghini

Trees are seen at a seed nursery for a reforestation project in Itapua do Oeste, Brazil, February 18, 2020. Picture taken February 18, 2020. REUTERS/Alexandre Meneghini

Forest Engineer Felipe Esbrissa and environmentalist Dejesus Aparecido walk at the National Forest of Jamari in Itapua do Oeste, Brazil, February 17, 2020. Picture taken February 17, 2020. REUTERS/Alexandre Meneghini

Farmer Ailson Guerra shows a tree that will be planted in a reforestation project in Itapua do Oeste, Brazil, February 17, 2020. Picture taken February 17, 2020. REUTERS/Alexandre Meneghini

Brazil nuts in their shells are seen at a seed nursery for a reforestation project in Itapua do Oeste, Brazil, February 18, 2020. Picture taken on February 18, 2020. REUTERS/Alexandre Meneghini

Environmentalist Dejesus Aparecido checks a tree at the National Forest of Jamari in Itapua do Oeste, Brazil, February 17, 2020. Picture taken on February 17, 2020. REUTERS/Alexandre Meneghini

Vinicius Dos Santos, who is threatened by loggers and stockbreeders, shows his son an acai palm tree to reforest their house at the Virola-Jatoba Sustainable Development Project (PDS) in Anapu, Para state, Brazil, September 5, 2019. Picture taken September 5, 2019. REUTERS/Nacho Doce

Environmental agents prepare to climb Spanish firs (Abies pinsapo) to pick up pine cones on top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

A branch of a Spanish fir (Abies pinsapo) is seen while an environmental agent (not pictured) picks up pine cones on top of it to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent shows pine cones of Spanish firs (Abies pinsapo) after picking up them on top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent shows his gloves stained with resin after picking up pine cones of Spanish firs (Abies pinsapo) on top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent shows a pine cone of a Spanish fir (Abies pinsapo) after picking it up on top of it to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

Environmental agents carry sacks with pine cones of Spanish firs (Abies pinsapo) after picking up them on the top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

The torn clothes of an environmental agent are pictured after he picked up pine cones of Spanish firs (Abies pinsapo) on top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent shows a pine cone of a Spanish fir (Abies pinsapo) after picking up it on top of it to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

The seeds of a pine cone of a Spanish fir (Abies pinsapo) are seen after they were collected for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

Environmental agents carry sacks with pine cones of Spanish firs (Abies pinsapo) after picking up them on the top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

Environmental agents carry sacks with pine cones of Spanish firs (Abies pinsapo) after picking up them on the top of them to collect their seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves nature park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent prepares to climb a Spanish fir (Abies pinsapo) to pick up pine cones on top of it to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent picks up pine cones on top of a Spanish fir (Abies pinsapo) to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent walks to climb a Spanish fir (Abies pinsapo), (C), to pick up pine cones on top of it to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent picks up pine cones on top of a Spanish fir (Abies pinsapo) to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent picks up pine cones on top of a Spanish fir (Abies pinsapo) to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent picks up pine cones on top of a Spanish fir (Abies pinsapo) to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

An environmental agent picks up pine cones on top of a Spanish fir (Abies pinsapo) to collect its seeds for reforestations in new areas of Andalusia, at the Sierra de las Nieves natural park and biosphere reserve, which is in the last step of a long process to be declared as National Park and is the largest population of Spanish firs in Europe, in Ronda, southern Spain, November 9, 2018. REUTERS/Jon Nazca

Residents walk along the Sitie Ecological Park in the Vidigal slum in Rio de Janeiro, Brazil, June 2, 2015. The Park, that is a reforestation, agriculture and recycling project, was built after removing 16 tons of garbage which people had piled up above the hill, according to the founder Brazilian Mauro Quintanilla. REUTERS/Pilar Olivares