Dems block measure to to speed up oil leases off the U.S. coast

Signals from mobile phones may be partly to blame for mysterious decline of bee populations around the world

Winners of 2011 Growing Green Awards announced this week.

Military steps up effort to go green.

Deliveries of the $88K plug-in hybrid will start next month.

Alex MacLean goes airborne to document the complex relationship between humans and nature.

Silicon Valley lays a bet on extreme weather insurance for farmers.

Climate change takes its toll on coffee yields in Latin America.

But Americans still pay little for fuel compared to most.