The globe is greening as plants grow faster in response to rising carbon dioxide. But a new analysis shows they aren't using more water to do it - a rare piece of good news for our changing planet.
Emerging research challenges the idea that sustainable housing is unaffordable. It shows sustainability and good design can be affordable when analyses include social, health and wellbeing benefits.
California's drought is dragging on into its fifth year. What can the state learn from Australia's 15-year millennium drought?