Following the U.S. Army Corps of Engineers' recent approval of the proposed Dakota Access Pipeline, a coalition of environmental activists held a rally in New York City's Union Square Park to oppose the project. Pacific Press/LightRocket via Getty Images hide caption

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Orange sediment laced with heavy metals is visible in the path of water coming out of the Natalie/Occidental Mine in southwestern Colorado. This mine is one of dozens on a proposed Superfund listing pending with the EPA. Several mines in the area have been leaching the tainted water for years — well before the Gold King Mine spill. Grace Hood/Colorado Public Radio hide caption

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One Year After A Toxic River Spill, No Clear Plan To Clean Up Western Mines

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The blue-green algae is called cyanobacteria. It can release toxins that affect the liver and nervous system. Greg Allen/NPR hide caption

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'A Government-Sponsored Disaster': Florida Asks For Federal Help With Toxic Algae

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Pilot tests discovered high levels of lead in three water fountains at this school on Chicago's South Side. The fountains were shut down and replaced with water coolers. Cheryl Corley/NPR hide caption

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High Lead Levels Discovered In Chicago School's Drinking Fountains

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National Public Radio host, Michel Martin asks a question at the live performance of Martin's show, Going There at Colorado State University Tuesday May 24, 2016. The show was titled, " The Future of Water." V. Richard Haro/Richard Haro Photography hide caption

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A Conversation About The Future Of Water

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Villagers throw containers into a well to collect their daily supply of potable water after a tanker made its daily delivery in Shahapur, India, on May 13. India is in the midst of a drought. INDRANIL MUKHERJEE/AFP/Getty Images hide caption

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A Warming World Means Less Water, With Economic Consequences

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President Obama drinks a glass of filtered Flint water during a meeting with federal officials at the Food Bank of Eastern Michigan in Flint, Mich., on Wednesday. Daniel Mears/AP hide caption

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