The failure of governments to agree with leading scientists on a major United Nations' report "risks impeding timely action ...

It is indisputable that climate change is being fueled by greenhouse gases, but what is less clear is where the tipping points may reside—breaking points where slowly building changes push parts of ...

Activity at Arizona's mines is surging, and so is the release of toxic materials. A new Environmental Protection Agency report shows that releases of mine tailings and other toxic emissions increased ...