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Seen from the sky: polluted waters around the world
Mugla, Turkey
andReuters Photographers
Updated 7 April
12 images
About 4 billion people experience severe water shortages for at least one month a year and around 1.6 billion people - almost 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 world body says water scarcity is increasing and more than half the world's population will be living in water-stressed regions by 2050.
The Rio Tiete which flows like a vast open sewer though Brazil's largest city Sao Paulo, is among the most polluted in the country. Over 100 km of the river are considered dead or too polluted for almost all marine life. The stinking river, which receives hundreds of tonnes of untreated sewage and waste every day, is a black mark on Brazil's wealthiest city.
In the run-up to the UN's World Water Day on March 22, Reuters photographers used drones to capture dramatic pictures and video of polluted waterways around the world.
In one image, a discarded sofa lies beached in the Tiete river, in Brazil's biggest city Sao Paulo, into which hundreds of tonnes of untreated sewage and waste are tipped each day.
The government has pledged to clean the Citarum river, considered among the world's most polluted, and make the water there drinkable by 2025, but household and industrial waste have continued to flow in its stream.
Others show domestic waste clogging the Citarum river in Bandung, Indonesia, and sewage flowing into the Euphrates in Najaf, Iraq.
Dr Julia Brown, a human geographer specialising in environment and development at the University of Portsmouth, said many countries with water-intensive agriculture and industry lacked adequate safe drinking water.
In 1969 the Cuyahoga River in Akron, Ohio, caught fire due to pollution, causing congress to pass the clean water act and the Ohio EPA was formed.
"When we buy products and buy food and clothing we don't always appreciate that we're actually importing somebody else's water and often those countries where we're importing water from, like in avocados or our denim jeans, they're actually very water-scarce countries," she told Reuters.
Brown added that, while extending access to water was important, maintaining that access in some of the poorest parts of the world was often overlooked.
Lake Baikal in Irkutsk region, Russia remains one of the world's cleanest fresh water reservoirs. But pollution and the growth of weeds are harming microorganisms, sponges and some molluscs that filter its waters. The Baikal pulp and paper mill and its sewage treatment facilities were closed seven years ago, but pollution has spread significantly since then, according to local media. That, some experts say, is because pollution left behind at the industrial site is draining into the lake.
"NGOs like to have their photographs taken with a shiny new hand pump ... then they walk away and it's handed over to communities to raise the funds to maintain these systems, to make sure that they're repaired. And if they're not?" she said.
"The research indicates at any one time one third of hand pumps across Sub-Saharan Africa are broken."
PHOTO EDITING MARIKA KOCHIASHVILI; WRITING STUART MCDILL AND ALEX RICHARDSON, EDITING MIKE COLLETTE-WHITE
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SLIDESHOW

Drainage system waterways around densely-populated Mexico City, like the Interceptor Poniente, are heavily polluted with sewage and trash from nearby communities. Access to reliable water services is limited in low-income areas. Mexico has one of the lowest shares of its population connected to public wastewater treatment plants in the Organization for Economic Co-operation and Development, according to the agency.

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