Al Jazeera: Scientists, environmentalists and world leaders alike have generally agreed that capping Earths temperature rise at 2 degrees Celsius would prevent the worst effects of climate change -- a cut-off touted again in the latest report by the Intergovernmental Panel on Climate Change (IPCC).
But many experts in the field, including former IPCC leaders, have said that even if global warming is kept to that limit, such a rise could nevertheless devastate the environment and endanger humanity -- the...