IPCC climate change report key points - in 60 seconds
31 March 2014 Last updated at 16:36 BST
There is overwhelming evidence that humans are experiencing the effects of climate change, says a new report.
Unless serious action is taken, this is likely to get worse, with growing risks of floods, food shortages, and threats to human health, warns the United Nation's Intergovernmental Panel on Climate Change (IPCC),
BBC News outlines the report's key points - in 60 seconds.
Video produced by Michael Hirst