Sand is the building block of megacities around the globe. People use 40 billion tons of it a year. But it's finite. And like oil, controlling it is a deadly endeavor.
Not long ago, Egypt all but threatened war if Ethiopia built a huge dam it was planning on part of the Nile River. Now the two countries have signed breakthrough agreement to allow the dam to go ahead. It's a big deal in a region with a history of tension over scarce water resources
What do you do when all other efforts to persuade locals to protect endangered rhinos have failed? Pay them to harvest the rhinos' dung and use it to make paper. That's what an Indian startup company is trying, with early success.
Brazilians are notoriously lavish bathers, taking as many as three showers a day. But as the country faces a major drought, they're trying to find way to keep up the shower numbers while still saving water.
The unprecedented water crisis in South America's largest city is leading citizens to change everything, from how they use water to how they engage with politics. But while the government is taking action, residents say it's not nearly enough.
São Paulo is facing an unprecedented water crisis that many saw coming, but no one did much to prevent. And with reservoirs hovering near 10% of capacity, many residents are turning to unhealthy stopgaps and worrying about unrest.
There may be a counterintuitive explanation for the deep freeze that hit New England this winter: The rapidly warming Arctic is causing big disruptions in the jet stream, which carries weather across North America. Is this the worst winter you've experienced?
China's $50 billion plan for a new Central American canal connecting Atlantic and Pacific may damage the freshwater Lake Nicaragua, changing the environment for those who depend upon it. The plan faces opposition in parts of the country.
Massive flooding in Malawi have forced nearly a quarter-million people from their homes, and many say they will never go home. Where will they go?
Global temperatures are going up but that doesn't necessarily mean less snow. Here's a brief explainer of what seems like a contradiction.