A cow stands on caked mud before a small patch of water at a dam as the region deals with a prolonged drought near Bulawayo, Zimbabwe, January 18, 2020. Picture taken January 18, 2020. REUTERS/Philimon Bulawayo

Caked mud is seen before a small patch of water as the region deals with a prolonged drought at a dam near Bulawayo, Zimbabwe, January 18, 2020. Picture taken January 18, 2020. REUTERS/Philimon Bulawayo

Soldiers patrol the Mormon community in La Mora, Sonora, Mexico January 10, 2020. Picture taken on January 10, 2020. REUTERS/Carlos Jasso

Clouds gather but produce no rain as cracks are seen in the dried up municipal dam in drought-stricken Graaff-Reinet, South Africa, November 14, 2019. Picture taken November 14, 2019. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

Clouds gather but produce no rain as cracks are seen in the dried up municipal dam in drought-stricken Graaff-Reinet, South Africa, November 14, 2019. Picture taken November 14, 2019. REUTERS/Mike Hutchings

A dead lamb lies in the veld on a farm near drought-stricken Graaff-Reinet, South Africa, November 16, 2019. Picture taken November 16, 2019. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY

Cracks are seen in the dried up municipal dam in drought-stricken Graaff-Reinet, South Africa, November 14, 2019. Picture taken November 14, 2019. REUTERS/Mike Hutchings

The skeleton of a dead goat lies in the veld on a farm near drought-stricken Graaff-Reinet, South Africa, November 16, 2019. Picture taken November 16 2019. REUTERS/Mike Hutchings

A view shows dried cracked up soil on the edge of the Lake Wegnia, in Sahel region of Koulikoro, Mali November 23, 2019. Picture taken November 23, 2019. REUTERS/Arouna Sissoko

Parched land is pictured around the Lake Wegnia, in Sahel region of Koulikoro, Mali November 22, 2019. Picture taken November 22, 2019. REUTERS/Arouna Sissoko

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.

Canals are pictured among burnt land after a forest fire near Banjarmasin in South Kalimantan province, Indonesia, September 29, 2019. REUTERS/Willy Kurniawan REFILE - CORRECTING NAME OF THE PROVINCE

Burnt land is pictured next to a palm oil plantation after fires near Banjarmasin in South Kalimantan province, Indonesia, September 29, 2019. REUTERS/Willy Kurniawan REFILE - CORRECTING NAME OF THE PROVINCE

A motorist rides a motorbike on a road through an area burnt due to the forest fires near Banjarmasin in South Kalimantan province, Indonesia, September 29, 2019. REUTERS/Willy Kurniawan REFILE - CORRECTING NAME OF THE PROVINCE

Palm oil plantation is pictured next to a burnt forest near Banjarmasin in South Kalimantan province, Indonesia, September 29, 2019. REUTERS/Willy Kurniawan REFILE - CORRECTING NAME OF THE PROVINCE

Capybaras are seen next to the road during prolonged drought conditions near San Rafael, Bolivia, September 27, 2019. REUTERS/David Mercado TPX IMAGES OF THE DAY

Capybaras are seen next to the road during prolonged drought conditions near San Rafael, Bolivia, September 27, 2019. REUTERS/David Mercado

Capybaras are seen next to the road during prolonged drought conditions near San Rafael, Bolivia, September 27, 2019. REUTERS/David Mercado

A boat ramp leads to the drought-affected Split Rock Dam near Tamworth in rural Australia September 23, 2019. Picture taken September 23, 2019. REUTERS/Jonathan Barrett

A water level indicator stands next to a near-empty creek near the town of Uralla in rural Australia September 24, 2019. Picture taken September 24, 2019. REUTERS/Jonathan Barrett

Cattle are seen near San Ignacio de Velasco, Bolivia, September 25, 2019. Picture taken September 25, 2019. REUTERS/David Mercado

Cattle are seen near San Ignacio de Velasco, Bolivia, September 25, 2019. Picture taken September 25, 2019. REUTERS/David Mercado

Cattle are seen near San Ignacio de Velasco, Bolivia, September 25, 2019. Picture taken September 25, 2019. REUTERS/David Mercado

Cattle are seen near San Ignacio de Velasco, Bolivia, September 25, 2019. Picture taken September 25, 2019. REUTERS/David Mercado

Cattle are seen in Santa Teresita, Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

A cow is seen in Santa Teresita, Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

Cattle are seen in Santa Teresita, Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

A capybara is seen in Santa Teresita, Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

A plant is seen in a burned forest at the Nembi Guasu conservation area in the Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

Charred trees are pictured near Robore, Bolivia, September 24, 2019. REUTERS/Edgard Garrido

A view shows a burned forest at the Nembi Guasu conservation area in the Charagua, Bolivia, September 24, 2019. REUTERS/David Mercado

Trees charred are pictured near Robore, Bolivia, September 23, 2019. REUTERS/Edgard Garrido

A dried-out part of Lake Koronia, Greece, September 19, 2019. Picture taken September 19, 2019. REUTERS/Alexandros Avramidis

A dried-out part of Lake Koronia, Greece, September 19, 2019. Picture taken September 19, 2019. REUTERS/Alexandros Avramidis

An aerial view shows a deforested plot of the Amazon near Porto Velho, Rondonia State, Brazil, September 17, 2019. REUTERS/Bruno Kelly

An aerial view shows a deforested plot of the Amazon near Porto Velho, Rondonia State, Brazil, September 17, 2019. REUTERS/Bruno Kelly

An aerial view shows a deforested plot of the Amazon near Porto Velho, Rondonia State, Brazil, September 17, 2019. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

An aerial view shows a deforested plot of the Amazon near Porto Velho, Rondonia State, Brazil, September 17, 2019. REUTERS/Bruno Kelly

Dried mud is seen during a low-level period of water in Concepcion reservoir on the outskirt of Tegucigalpa, Honduras September 14, 2019. REUTERS/Jorge Cabrera

Dried mud is seen during a low-level period of water in Concepcion reservoir on the outskirt of Tegucigalpa, Honduras September 14, 2019. REUTERS/Jorge Cabrera

Dried mud is seen during a low-level period of water in Concepcion reservoir on the outskirt of Tegucigalpa, Honduras September 14, 2019. REUTERS/Jorge Cabrera

Dried mud is seen during a low-level period of water in Concepcion reservoir on the outskirt of Tegucigalpa, Honduras September 14, 2019. REUTERS/Jorge Cabrera

A deforested and burnt area is seen in an indigenous area used as a cattle pasture in Areoes, Mato Grosso state, Brazil, September 4, 2019. Picture taken September 4, 2019. REUTERS/Lucas Landau

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.

A dry pond is pictured in a village of Menhai county in Xishuangbanna Dai Autonomous Prefecture, Yunnan Province, China, July 12, 2019. Picture taken July 12, 2019. REUTERS/Aly Song

A dead fish is seen in a dry pond in a village of Menhai county in Xishuangbanna Dai Autonomous Prefecture, Yunnan Province, China, July 12, 2019. Picture taken July 12, 2019. REUTERS/Aly Song

A dead fish lies on the bank of Mekong River in Nakhon Phanom, Thailand July 24, 2019. Picture July 24, 2019. REUTERS/Soe Zeya Tun

A view of Monument Valley in Utah, US, June 27, 2019. Picture taken June 27, 2019. REUTERS/Pamela J. Peters

Laundry hangs out to dry in a residential apartment complex in Hong Kong, China, June 27, 2019. REUTERS/Thomas Peter

Laundry hangs out to dry in a residential apartment complex in Hong Kong, China, June 27, 2019. REUTERS/Thomas Peter

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

Empty metal pitchers to fetch water are seen in an opening made to filter water next to a polluted lake in Thane, India June 13, 2019. REUTERS/Prashant Waydande

A dry field is pictured close to Liebenwalde, Germany, April 25, 2019. REUTERS/Hannibal Hanschke

A lone tree stands near a water trough in a drought-effected paddock on Jimmie and May McKeown's property located on the outskirts of town of Walgett, in New South Wales, Australia, July 20, 2018. REUTERS/David Gray SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY.

Houses are seen on a hilltop overlooking arid land outside Mekelle, Tigray region of northern Ethiopia December 10, 2018. Picture taken December 10, 2018. REUTERS/Maggie Fick

A healthcare worker holds washed parts of protective gear at a transit centre in Beni, North Kivu Province of Democratic Republic of Congo, December 15, 2018. REUTERS/Goran Tomasevic

A healthcare worker holds washed parts of protective gear at a transit centre in Beni, North Kivu Province of Democratic Republic of Congo, December 15, 2018. REUTERS/Goran Tomasevic

Women dry fish on the Mekong river bank in Kandal province, Cambodia, December 14, 2018. REUTERS/Samrang Pring

A Syrian border guard on the Syrian side of the Iraqi-Syrian border, as seen from al-Qaim, Iraq, November 26, 2018. Picture taken November 26, 2018. REUTERS/Alaa al-Marjani

An outdoor toilet can be seen next to a house in the village of Papa Lealea located on the outskirts of Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray