California

Environmental group files suit alleging Ivanpah approval came without due consideration to wildlife and the environment

California ports test seawater scrubber that aims to slash sulphur oxide and diesel soot emissions

Wave of solar plants faces legal challenge, despite government approval

New research reveals success of air quality rules

Cap-and-trade scheme to "fill the vacuum created by the failure of Congress to pass any kind of climate or energy legislation"

Western states are considering entering the North East Regional Greenhouse Gas Initiative

"Oil companies flexed their muscles and we flexed back and won"

Regional carbon trading scheme on track to launch in 2012

High-profile taxi trial will see four battery-switching stations installed in the Bay Area

California governor fights hard to protect his green legacy, taking on oil executives who aim to annul law via Proposition 23