US Congress proposes legislation to force Environmental Protection Agency to allow California and other states to set their own stringent car emissions rules

PG&E begins to power 5,000 homes using cow manure as methane capture specialist BioEnergy Solutions outlines plans for a further 150 plants

"The marketing is greener than the product," claim campaigners

Californian businesses band together to share green energy purchasing and installation best practices

Lawsuit claims change to reporting criteria for businesses' toxic waste " unlawfully" weakens reporting requirements and allows chemical plants to "keep the public in the dark"

Research on the environmental impact of solar panel manufacturing processes finds thin-film cells offer greenest option

Whether it's through e-commerce, offsets or sailing firms are increasingly looking to ways to cut the carbon footprint of their shipping operations

As report argues photovoltaics lack market viability lobbyists push for tax credits top be extended

Automotive giant insists vice chairman's dismissal of global warming as a " crock of shit" does not reflect the company's position

After securing a major deal with Indian giant Tata air powered car firm MDI plans to take its low carbon vehicle to the US