Sustainability

Retreating glaciers could affect water supplies

Wind could feed world's total energy demand

Self-healing gel stretches to 21 times its length

Extreme weather set to push food prices much higher

Ford takes on Toyota's Prius with C-Max hybrid

Tigers change behavior to live near people

Warming Earth could boost biodiversity… eventually

Geoengineering 'feasible and affordable'

Ocean methane source explained

Antarctic ice could be hiding methane