National Public Radio: A new United Nations report is warning that fossil fuels must be entirely phased out by the end of the century in order to avoid dangerous and irreversible damage to the Earth's climate.
The Intergovernmental Panel on Climate Change (IPCC) says the world faces "severe, pervasive and irreversible" consequences if greenhouse gas emissions are not cut to zero by 2100.
Examples of "irreversible" change include a runaway melt of the Greenland ice cap that would trigger devastating sea-level rise...