“This report should awaken world leaders out of their slumber on climate change. A 4 degree temperature rise would bring unimaginable costs to people and society. We must take the necessary actions now to stay within 2 degrees or lower of warming.
“The differences between 2 degrees and 4 degrees temperature rise are stark. It took little more than four degrees of cooling to create the Ice Age, so imagine the havoc 4 degrees of warming would create. While the impacts would be uneven around the globe, vulnerable countries and poor people would be hardest hit. Communities already facing economic hardship would face longer droughts and more intense monsoons that disrupt food supply, more diseases associated with warmer temperatures and more pests, and greater water scarcity.