World Water Day 2021 highlights dire predictions of growing scarcity

About fourbillion people experience severe water shortages for at least one month a year, and around 1.6 billionalmost a quarter of the world's population have problems accessing a clean, safe water supply, according to the United Nations.

While the UN's sustainable development goals call for water and sanitation for all by 2030, the international organization says scarcity is increasing and more than half the people on Earthwill be living in water-stressed regions by 2050.

The UN's World Water Day, held March 22 every year since 1993, aims to raise awareness aboutthe realitythat so many people are living without access to safe water.

In the run-up to World Water Day 2021, Reuters photographers used drones to capture dramatic pictures and video of polluted waterways around the world.

Clogged with waste

Indonesia's CitarumRiver in West Java is seen here on March 15, jammed with wastefrom households and factories that produce textiles.The Indonesian government has pledged to clean the river, which is considered among the world's most polluted.

(Willy Kurniawan/Reuters)

Below, the Pisang Batu River on the outskirts of Jakarta made national headlines in 2019 after plastic garbage and organic waste from nearby households covered its surface, stretching 1.5 kilometres. The river now has lesswaste after several cleanup operations, but the water remainsblack and emitsa strong odour.

(Willy Kurniawan/Reuters)

More waterways as dumping grounds

An aerial view shows garbage and sewage on the shore of GuanabaraBay in Rio de Janeiro, on March 17. Rivers that criss-cross metropolitan Rio dump hundreds of millions of litres of raw sewage into the bay each day.

(Pilar Olivares/Reuters)

An aerial view shows a discarded sofa on the TieteRiver near Ecological Tiete Park in Sao Paulo, Brazil, on March 17. The Rio Tiete, which flows like a vast open sewer though Brazil's largest city Sao Paulo, is among the most polluted rivers in the country.

(Amanda Perobelli/Reuters)

The Interceptor PonienteCanal in Cuautitlan is part of a drainage system for waterways around Mexico City and is heavily polluted with sewage and trash from nearby communities.

(Carlos Jass/Reuters)

An aerial photo taken March 16 shows a drain pipe feeding into the Euphrates River carrying sewage, near Najaf, Iraq.

(Thaier Al-Sudani/Reuters)

Senegal's Hann Bay, seen here on March 17, is contaminated with garbage and raw sewage flowing via open channels into the ocean on the eastern edge of Dakar's Peninsula. The shorefront is discoloured by stagnant algae.

(Zohra Bensemra/Reuters)

Microplastic pollution

The River Tame is seen near Denton, England on March 17. A University of Manchester report in 2018 found that the riverhad "the worst"level of microplastic pollution ever recorded anywhere in the world at that time.

(Phil Noble/Reuters)

Plastic trash

Two barges attempt to collect plastic trash that threatensto clog a dam on Potpecko Lake andthe functioning of anearbyhydroelectric plant near the town of Priboj, Serbia, on Jan. 29.

(Marko Djurica/Reuters)

Fresh-water reservoir under threat

Lake Baikal in Russia's Irkutsk regionremains one of the world'scleanest fresh-water reservoirs. But some experts say it's feared that pollution left behind from a pulp and paper millthat closed seven years ago is draining into the lake.

(Maxim Shemetov/Reuters)

Waste-fuelled fires

Factory waste in the Cuyahoga River in Akron, Ohio, has been cleaned up over several decades to the extent that the waterway no longer catches fire, as it did 13 times by 1969. The river empties into Lake Erie.

(Megan Jelinger/Reuters)

Art highlights impact of climate change

This portrait of an Ethiopian girl carrying water was carved into the sand at Whitby Beach, England, to symbolize climate change and drought. The portrait, seen here on March 15, was meant to be temporary. The rising tide soon washed it away.

(Nadiya Hussain/Reuters)