State angered over Environmental Protection Agency's rejection of request for scaling back of US biofuel targets to address soaring corn prices
Environmental Protection Agency threatened with fresh legal action over failure to reach a decision on whether or not to regulate carbon emissions
But rules imposing cleaner fuel on ships on track for 2009 launch
Environmentalists reiterate calls for more stringent carbon regulation after details of government report emerge linking manmade climate change to health risks
As scientists uncover an offshore plate that could hold up to a century's worth of US emissions the administration publishes its new framework for CCS projects
Officials force decision on whether Clean Air Act can be used to cap US carbon emissions into inbox of next president