Tough new air pollution standards will require ships in US waters to cut nitrogen oxide emissions by 80 per cent
Long-running battle between California and the EPA ends after the state is granted freedom to set its own car emission standards
New proposals designed to speed up process for assessing risks from new chemicals
New $10.5bn budget earmarks cash for central carbon credit registry
IT, retail and public sector dominate US list of top green power purchasers
Landmark ruling strengthens Obama's hand as he tries to force through climate change bill
Landmark ruling on whether carbon emissions can be regulated under the Clean Air Act could be just weeks away
Environmental Protection Agency sends proposal for endangerment finding to White House
President says $129bn that has been allocated for environmental plans is off limits to Congress
Environmental Protection Agency cranks up inspections and scraps controversial scheme that promised businesses reduced environmental inspections in return for voluntary pollution commitments