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?
After scoring some big victories in the US in 2014, the movement to get institutions to cut their ties to fossil fuel companies is broadening its focus in the UK to include big name museums and even toy companies.
With coal use falling fast in the US but still growing in Asia, western coal producers are pitching a plan to build five big new coal export terminals in Washington and Oregon, but opponents warn of big new environmental risks.