Climate change intensifies conflicts, John Kerry says

Negative effects of climate change such as extreme drought are linked to deadly violence in countries such as Syria and Nigeria, and those still denying there's a problem are putting the entire planet at risk, the US secretary of state said.

U.N. panel: Climate change effects 'irreversible'

Climate change will lead to increased poverty, sickness, violence and refugees, according to a report from a U.N. scientific panel Monday.

The report by the Intergovernmental Panel of Climate Change outlined the causes, effects and solutions to global warming with the latest figures from 2013.

It warned that the impacts of global warming are likely to be "severe, pervasive and irreversible."

Michel Jarraud, the Secretary-General of the World Meteorological Organization (WMO), a co-sponsor of the climate panel, said the report was "the most solid evidence you can get in any scientific discipline."