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The Aral Sea has nearly disappeared over the last 60 years. Now, its source rivers are depleting.

The Orange County Water District's wastewater recycling program uses ponds, manmade waterfalls and technology to keep wells from running dry -- a model for other regions facing water scarcity.

Once one of the worlds largest inland lakes, Asia's Aral Sea has evaporated into desert, dried by Soviet era irrigation plans. One village in Kazakhstan sits on the shrinking shores of the Aral Sea.

Land re-emerging from dried out reservoirs seems to be thriving with native plants. They're out-competing invasive weeds that are choking the river elsewhere.

More than a million species are at risk of extinction, many within decades, because of human actions. Among them? The khuli, Hawaii's native tree snails that are some of the most endangered animals on the planet. At one point, there used to be about ...

This week and next, world leaders are gathering in Colombia for the 16th United Nations Convention on Biological Diversity to check up on their collective progress in slowing biodiversity loss.Can they successfully turn those plans into action ...

The SS United States, the fastest ocean liner to ever cross the Atlantic, is preparing for one final voyage. Then it'll be sunk and turned into the world's largest artificial reef.