Blue and Green: US president Barack Obamas plans to curb greenhouse gas emissions have been mostly backed by the Supreme Court. Some limits have been placed on the plans, including exempting some smaller emitters. Earlier this month, the US Environmental Protection Agency (EPA) unveiled a new strategy that aims to cut carbon pollution from fossil fuel power plants by 30% by 2030. The organisation added that the net climate and health benefits of the move would add up to $82 billion (48bn). A group of 128 companies...