3C hotter. Earth’s danger point. Now scientists say it is going to happen

The world will warm by 3C (5.4F) even under emissions projections for 2050 that leading scientists consider optimistic, the United Nations group that studies global warming has said.

The increase, which would cause drought and famine for 400 million people and devastate wildlife, is predicted by the Intergovernmental Panel on Climate Change (IPCC) in its most confident assessment yet of how greenhouse gases are affecting global temperatures.

A draft of part of the panel