EPA

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"

Minor change to Cross-State Air Pollution Rule will lead to increase in emissions

Affected coal and gas plants may be able to emit up to four per cent more than previously planned

Administrator Lisa Jackson admits the agency will miss target to float new utility-focused proposals by end of September