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When is it safe to burn fields? In Thailand, farmers can turn to a new app to check. Zach Bernsten & Carmela Guaglianone
Amazingly, forests are still sucking up as much carbon as they were 30 years ago. But there’s a catch Sachi Kitajima Mulkey
Tribes in Minnesota are paying the steepest price for the steel industry’s mercury pollution Lylla Younes