EPA

'War on Coal' bill threatens powers of Environmental Protection Agency to regulate emissions but is unlikely to pass Senate

Environmental Protection Agency said to have overstepped its authority by bringing in stringent air pollution rules

Watchdog states new permitting rules will only apply to facilities producing more than 100,000 tons a year of carbon emissions

Federal appeal court rules agency does have the right to limit greenhouse gas output from power plants and vehicles

New rules to cut carbon dioxide emissions will make it nearly impossible to build new coal power plants

Court rules limits on sulphur dioxide and nitrogen oxide output need further review, as Keystone pipeline stand-off continues

Regulations could see 70GW of coal production shut down, but are expected to save $90bn in healthcare spending by 2016

Regulator has now postponed regulations on power plant emissions, smog, and mercury pollution this year

EPA administrator Lisa Jackson tells TV interviewer regulations should be released early 2012, but gives no further details

Decision to delay tighter smog rules branded "illegal and irresponsible"