'No nation is immune' to climate change, Obama tells gradsPresident Barack Obama said climate change poses a risk to global security, during a commencement address to the graduating class of the U.S. Coast Guard Academy. Rising seas, thawing permafrost and longer wildfires caused by warmer global temperatures threaten U.S. military bases and will change the way the armed services defend the country, Obama said.
■Class discussion: What do U.S. military planners say about climate change and its threat to our security? How could climate change trigger future wars? Has climate change already impacted U.S. military operations or bases? Military leaders and 83 percent of Americans believe climate change is a threat, so why do many politicians deny it exists? What is driving politicians to oppose efforts to cut global emissions?