UN chief warns of 'point of no return' on climate change

U.N. Secretary-General Antonio Guterres said Sunday that the world's efforts to stop climate change have been "utterly inadequate" so far and there is a danger global warming could pass the "point of no return."

How to talk about climate change

The United Nations' Intergovernmental Panel on Climate Change released a report last fall warning of a catastrophic effect on the world's people, environment and economy if temperatures rise by more than 1.5 degrees Celsius, ...