A fire burns in the exclusion zone around the Chernobyl nuclear power plant, outside the village of Rahivka, Ukraine April 5, 2020. Picture taken April 5, 2020. REUTERS/Yaroslav Yemelianenko

Smoke rises from a forest fire in the exclusion zone around the Chernobyl nuclear power plant, outside the village of Rahivka, Ukraine April 5, 2020. Picture taken April 5, 2020. REUTERS/Yaroslav Yemelianenko

A man views flooded properties beside the River Severn in Ironbridge, Britain, February 27, 2020. REUTERS/Toby Melville

Foam covers the Santiago River, whose polluted waters have been linked to global manufacturers by the government of the Mexican state of Jalisco, in Juanacatlan, Mexico February 7, 2020. Picture taken February 7, 2020. REUTERS/Fernando Carranza

A flooded street is pictured after heavy rainfall in Tiquipaya, Bolivia, February 22, 2020. REUTERS/Danilo Balderrama

The moon shines over icebergs near Fournier Bay, Antarctica, February 3, 2020. REUTERS/Ueslei Marcelino SEARCH "ANTARCTICA PENGUINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A cracked mirror leans against the rock face of a cathedral-like rock cavity after a wildfire raged through the wedding venue in Kangaroo Valley, New South Wales, Australia, January 23, 2020. REUTERS/Thomas Peter

Melted metal from a vehicle destroyed in the recent bushfires is pictured in Conjola Park, New South Wales, Australia, January 21, 2020. REUTERS/Loren Elliott

Algae are seen in a fishing net near Mekong river bank outside Nong Khai, Thailand January 10, 2020. REUTERS/Soe Zeya Tun

Algae are seen in a fishing net on the Mekong river bank outside Nong Khai, Thailand January 10, 2020. REUTERS/Soe Zeya Tun

The sun rises over dried up lake Pamamaroo, outside of Menindee, Australia, September 2, 2019. Prolonged drought exacerbated by demands on water resources by irrigators and cities means the Darling River (Barka) is running dry. The towns of Menindee and Wilcannia avoid drinking tap water, relying instead on charity donations of 10-litre boxes of water and rain tank water for potable uses. REUTERS/Tracey Nearmy SEARCH "NEARMY DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A giraffe walks near the elevated railway line that allows movement of animals below the Standard Gauge Railway (SGR) line linking Nairobi and Naivasha inside the Nairobi national park in Nairobi, Kenya October 16, 2019. REUTERS/Njeri Mwangi TPX IMAGES OF THE DAY

Giraffes walk near the elevated railway line that allows movement of animals below the Standard Gauge Railway line linking Nairobi and Naivasha inside the Nairobi national park in Nairobi, Kenya October 16, 2019. REUTERS/Njeri Mwangi

Giraffes walk as a motorist drives near the elevated railway line that allows movement of animals below the Standard Gauge Railway (SGR) line linking Nairobi and Naivasha inside the Nairobi national park in Nairobi, Kenya October 16, 2019. REUTERS/Njeri Mwangi

A giraffe walks near the elevated railway line that allows movement of animals below the Standard Gauge Railway (SGR) line linking Nairobi and Naivasha inside the Nairobi national park in Nairobi, Kenya October 16, 2019. REUTERS/Njeri Mwangi

A group of impala graze near the elevated railway line that allows movement of animals below the Standard Gauge Railway (SGR) line linking Nairobi and Naivasha inside the Nairobi national park in Nairobi, Kenya October 16, 2019. REUTERS/Njeri Mwangi

A wind-driven wildfire burns near power line tower in Sylmar, California, U.S., October 10, 2019. REUTERS/ Gene Blevins

A wind-driven wildfire burns near power line tower in Sylmar, California, U.S., October 10, 2019. REUTERS/ Gene Blevins

A camp staff feeds Ayeyar Sein, a four-month-old baby elephant who lost her parents to poachers, after her daily wound cleaning in Wingabaw Elephant Camp, Bago, Myanmar, September 30, 2019. Picture taken September 30, 2019. REUTERS/Ann Wang TPX IMAGES OF THE DAY

A burning tree is seen during a fire in an area of the Amazon rainforest in Itapua do Oeste, Rondonia State, Brazil, September 11, 2019. Picture taken September 11, 2019. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

A burning tree is seen during a fire in an area of the Amazon rainforest in Itapua do Oeste, Rondonia State, Brazil, September 11, 2019. Picture taken September 11, 2019. REUTERS/Bruno Kelly

The Wahlenberg Glacier is seen in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay

The Wahlenberg Glacier is seen in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay

The Wahlenberg Glacier is seen in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay

The Wahlenberg Glacier is seen in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay

The Villarrica Volcano is seen at night from Pucon town, Chile, September 11, 2019. REUTERS/Cristobal Saavedra Escobar

A fire burns a tract of Amazon jungle near Porto Velho, Brazil September 9, 2019. Picture taken September 9, 2019. REUTERS/Bruno Kelly

The Dom des Mischabel mountain is pictured from Belalp, Switzerland, September 4, 2019. Picture taken September 4, 2019. REUTERS/Denis Balibouse

The Fletschhorn mountain is pictured from Belalp, Switzerland, September 4, 2019. Picture taken September 4, 2019. REUTERS/Denis Balibouse

Corn, frozen overnight by plummeting temperatures, lays on a rooftop made of totora plant in Qewaya village, Lake Titicaca, Bolivia, July 3, 2018. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Algae floats in shallow water in Cohana bay, Lago Menor, Bolivia, January 30, 2019. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A sign that reads "2000 pesos fine for rubbish dumping" stands in Desaguadero village, Lago Menor, Bolivia, July 12, 2018. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

The Svalbard Church, which claims to be the world's northernmost church, stands in the town of Longyearbyen in Svalbard, Norway, August 3, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

White wooden gravestones at risk of landslides due to the thawing permafrost underneath the ground, stand at the side of a mountain in the Longyearbyen cemetery in the town of Longyearbyen in Svalbard, Norway, August 3, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A pile of antlers are seen on a ski sled in the town of Longyearbyen in Svalbard, Norway, August 6, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

An aerial view shows snow-covered mountains in Svalbard, Norway, August 3, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

The Wahlenberg Glacier is seen in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

An iceberg floats near the Wahlenberg Glacier in Oscar II land at Spitsbergen in Svalbard, Norway, August 5, 2019. REUTERS/Hannah McKay SEARCH "SVALBARD CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A burning tract of Amazon jungle is pictured in Porto Velho, Brazil August 25, 2019. REUTERS/Ricardo Moraes

An aerial view of a deforested plot of the Amazon in Boca do Acre, Amazonas state, Brazil August 24, 2019. REUTERS/Bruno Kelly

A snake is seen while a tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A snake is seen while a tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A snake is seen while a tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A snake is seen while a tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

A tract of the Amazon jungle burns as it is cleared by loggers and farmers in Porto Velho, Brazil August 24, 2019. REUTERS/Ueslei Marcelino

Train tracks that link Santa Cruz and Corumba, Brazil are seen in an area where wildfires have destroyed hectares of forest, near Robore, Bolivia, August 24, 2019. REUTERS/David Mercado

A man walks through the dried-up Puzhal reservoir, on the outskirts in Chennai, India, June 20, 2019. REUTERS/P. Ravikumar

A woman draws water from a well in Petit-Bassam neighbourhood of Abidjan, Ivory Coast, March 21, 2019. REUTERS/Thierry Gouegnon

Water drips from a faucet in a private home in this photo illustration taken in Bordeaux, France, March 19, 2019. REUTERS/Regis Duvignau/Photo Illustration

Water flows from a faucet in a private home in this photo illustration taken in Bordeaux, France, March 19, 2019. REUTERS/Regis Duvignau/Photo Illustration

The carcass of a cow is seen at a ranch as the Caribbean nation endures its worst drought in 30 years, in Santiago Rodriguez, Dominican Republic March 16, 2019. Picture taken March 16, 2019. REUTERS/Ricardo Rojas

Students take part in a "youth strike to act on climate change" demonstration in Nice, France, March 15, 2019. REUTERS/Eric Gaillard

An iceberg floats in a fjord near the town of Tasiilaq, Greenland, June 18, 2018. REUTERS/Lucas Jackson SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY.

Firefighters battle the Woolsey Fire as it continues to burn in Malibu, California, U.S., November 11, 2018. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

Firefighters battle the Woolsey Fire as it continues to burn in Malibu, California, U.S., November 11, 2018. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

Street lights partially submerged are seen along the Po river in Turin, Italy, November 6, 2018. REUTERS/Massimo Pinca

A sign directs voters to a new polling location where Hurricane Michael destroyed many schools and other buildings used as polling stations in the area in Lynn Haven, Florida, U.S., November 5, 2018. REUTERS/Terray Sylvester

A damaged car is seen in the aftermath of the flooding of Milicia river in Casteldaccia, near Palermo, Italy, November 4, 2018. REUTERS/Guglielmo Mangiapane