Austrians scientists use light ultra violet light to attract insects at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Selenica, Albania. May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

General view of Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', is pictured in Brataj, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

A butterfly is pictured near Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Austrian entomologist Gernot Kunz uses ultra violet light to attract insects at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Selenica, Albania. May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Scientist work by the Shushica river with is one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Plants are seen near Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

A scientist is seen by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Austrians scientists use ultra violet light to attract insects at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

An Austrian scientist works by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Shoes are seen near Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Shoes are seen near Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

A scientist is seen by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

Plants are seen near Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

A toad is pictured at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Selenica, Albania May 31, 2021. Picture taken May 31, 2021. REUTERS/Florion Goga

A river spider is pictured in Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

A river crab is pictured in Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

Austrian scientist Lukas Zangl shows a scorpion at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

A toad is pictured in Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

A river crab is pictured at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

Austrian scientist work by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

Austrian scientist Lukas Zangl shows a scorpion at Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe' in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

Austrian scientist work by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

A toad is pictured by Shushica river, one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

Austrian scientist work by Shushica river with is one of the biggest tributaries of the Vjosa river, which environmentalists call 'the last wild river in Europe', in Brataj, Albania May 30, 2021. Picture taken May 30, 2021. REUTERS/Florion Goga

A fisherman is seen next to docked scattered boats on a dried up tributary that connects to the Tonle Sap lake in Kampong Khleang, Cambodia July 6, 2020. Picture taken July 6, 2020. REUTERS/Prak Chan Thul

Scattered boats are seen in the dried up tributary that connects to the Tonle Sap lake in Kampong Khleang, Cambodia July 6, 2020. Picture taken July 6, 2020. REUTERS/Prak Chan Thul

A Buddha statue overlooks docked scattered boats on a dried up tributary that connects to the Tonle Sap lake in Kampong Khleang, Cambodia July 6, 2020. Picture taken July 6, 2020. REUTERS/Prak Chan Thul TPX IMAGES OF THE DAY

Scattered boats are seen in the dried up tributary that connects to the Tonle Sap lake in Kampong Khleang, Cambodia July 6, 2020. Picture taken July 6, 2020. REUTERS/Prak Chan Thul

Scattered boats are seen in the dried up tributary that connects to the Tonle Sap lake in Kampong Khleang, Cambodia July 6, 2020. Picture taken July 6, 2020. REUTERS/Prak Chan Thul

Reduced to a string of stagnant mustard-coloured pools, fouled in places with pesticide runoff and stinking with the rotting carcasses of cattle and fish, the Darling River is running dry. The parched earth of Australia's longest waterway, if tributaries are included, is in the grip of the continent's most severe drought in a century. At Menindee, 830 km west of Sydney, despair has turned to anger as residents blame the government for exacerbating the drought by drawing down river water in 2017 for irrigation and other uses downstream. Locals now avoid using tap water for drinking and washing babies and children, saying it has caused skin irritation, and prefer boxed and bottled water instead. REUTERS/Tracey Nearmy SEARCH "NEARMY DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Matching text: AUSTRALIA-DROUGHT/RIVER TPX IMAGES OF THE DAY

A field is sprinkled with the remnants of cotton after a harvest in Trangie, Australia, September 4, 2019. The parched earth of Australia's longest waterway, if tributaries are included, is in the grip of the continent's most severe drought in a century. Drought is weighing on economic growth, and the dire conditions have prompted Australia, a major wheat exporter, to import the grain for the first time in 12 years. REUTERS/Tracey Nearmy SEARCH "NEARMY DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Reduced to a string of stagnant mustard-coloured pools, fouled in places with pesticide runoff and stinking with the rotting carcasses of cattle and fish, the Darling River is running dry. The parched earth of Australia's longest waterway, if tributaries are included, is in the grip of the continent's most severe drought in a century. At Menindee, 830 km west of Sydney, despair has turned to anger as residents blame the government for exacerbating the drought by drawing down river water in 2017 for irrigation and other uses downstream. Locals now avoid using tap water for drinking and washing babies and children, saying it has caused skin irritation, and prefer boxed and bottled water instead. REUTERS/Tracey Nearmy SEARCH "NEARMY DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. Matching text: AUSTRALIA-DROUGHT/RIVER TPX IMAGES OF THE DAY

People paddle a dugout canoe along the Ruki river, a tributary to the Congo river, at sunset in Mbandaka, Democratic Republic of the Congo, October 20, 2018. REUTERS/Thomas Nicolon

The Ruki river, a tributary to the Congo river, flows along the rainforest near Mbandaka, Democratic Republic of the Congo, April 02, 2019. REUTERS/Thomas Nicolon

People paddle dugout canoes along the Ruki river, a tributary to the Congo river, at sunset in Mbandaka, Democratic Republic of the Congo October 19, 2018. REUTERS/Thomas Nicolon

Fishermen paddle along the Ruki river, a tributary to the Congo river, near the village of Bantoyi in the Democratic Republic of the Congo, April 9, 2019. REUTERS/Thomas Nicolon SEARCH "BUSHMEAT NICOLON" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A man rows his boat in the tributary waters of Vembanad Lake against the backdrop of pre-monsoon clouds on the outskirts of Kochi, India, June 7, 2019. REUTERS/Sivaram V TPX IMAGES OF THE DAY

Fishermen travel in a boat in the tributary waters of the Periyar River at Munambam on the outskirts of Kochi in the southern state of Kerala, India, January 21, 2019. REUTERS/Sivaram V

Maps showing Ganges and its tributaries as well as population density along the river.

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

A resident is seen during a fire at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Residents are seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Residents are seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Resident Ketlen dos Santos, 26, and her son Ralisson, 8, are seen next to their house after a fire at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Residents are seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Residents are seen after a fire at Educandos neighbourhood, on a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

A resident is seen after a fire at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 18, 2018. REUTERS/Bruno Kelly

Houses on fire are seen at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

Residents look at houses on fire at Educandos neighbourhood, a branch of the Rio Negro a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

Residents look at houses on fire at Educandos neighbourhood, a branch of the Rio Negro a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly TPX IMAGES OF THE DAY

A resident is seen during a fire at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly

Residents are seen during a fire at Educandos neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly

A resident is seen during a fire at Educando neighbourhood, a branch of the Rio Negro, a tributary to the Amazon river, in the city of Manaus, Brazil December 17, 2018. Picture taken December 17, 2018. REUTERS/Bruno Kelly