California

Twenty-one tech giants, from Adobe to WD, are identified as leaders, yet trouble brews among their peers

Rollback of federal climate policies may prompt state action on carbon pricing across the US

Non-profits with corporates such as Anheuser-Busch, Coca-Cola, General Mills are throwing their weight behind big water projects in the Golden State

Desert solar array in Arizona will be used to provide power to 14 US Navy bases in California

Last-minute deal breaks political stalemate to deliver $900m to programmes to cut greenhouse gases

Gleaming pipe sculpture could use solar power to desalinate up to 4.5 billion litres of drinking water every year

New goal would require US state to cut emissions 40 per cent below 1990 levels by 2030

People don't relate to future threats from climate change but seeing images of people dying now from air pollution drives them to act, says former governor of California

Carbon pricing is set to raise $22bn this year, as Vietnam adopts its own carbon market and China tightens cap-and-trade regulations

VW says 11 million vehicles globally fitted with defeat device, which helps cars pass emissions tests