National Geographic: A new report from the White House Council of Economic Advisers finds that for each decade of delay, policy actions on climate change increase total mitigation costs by approximately 40 percent. The cost of inaction--letting the temperature rise 3 degrees Celsius above preindustrial levels instead of 2 degrees-- could increase economic damages by about 0.9 percent of global output.
To put this percentage in perspective, 0.9 percent of estimated 2014 U.S. Gross Domestic Product (GDP) is approximately...