"Earth Day: scientists say 75% of known fossil fuel reserves must stay in ground", 22 Apr 2015

Three-quarters of known fossil fuel reserves must be kept in the ground if humanity is to avoid the worst effects of climate change, a group of leading scientists and economists have said in a statement timed to coincide with Earth Day... the group demanded governments adopt a goal of reducing economies’ carbon emissions to zero by mid-century, put a price on carbon and that the richest take the lead with the most aggressive cuts...The statement says that failure by the world to act on climate change would bring is a one in 10 chance of temperatures rising by more than 6C by 2100, a level of risk that would be comparable with accepting 10,000 plane crashes daily worldwide...