With frightening evidence for climate change mounting around the globe, from droughts and massive forest fires to melting glaciers and rising sea levels, you might think nations would wish to work together to meet such a grave threat. Instead, as U.S. climate negotiator Todd Stern reports, there has been only modest progress internationally in facing up to the challenge of climate change. Stern starts by describing the kinds of devastation beginning to ravage the planet and the perils we face as a result. He also acknowledges the shameful drift from fact to opinion among American political leaders when it comes to dealing with the science of climate change, and the companion drop in poll numbers of Americans deeply concerned by the problem. Nevertheless, Stern notes that the Obama administration has remained true to its policy of tackling the problem, focusing on clean energy R&D to transform the economy and cut emissions. He recounts proudly that investments made by the U.S. government are leading to advanced vehicle batteries, electric charging structures over the nation, and a vast increase in energy production from wind, solar and geothermal sources.  But progress internationally is much harder to come by. There are deep divisions among nations who gather to discuss the way forward under the umbrella of the United Nations Framework Convention on Climate Change (UNFCC). The main cause of acrimony involves a “firewall” between developed and developing nations, which sprang up in 1992 when the UN began work on an international treaty to reduce global warming. According to Stern, developing nations have approached these climate conventions insisting that legally binding commitments to reducing greenhouse gas emissions fall primarily on developed nations, which are responsible historically for the lion’s share of CO2 output. The problem with this argument today, says Stern, is that many of these developing nations have evolved such strong economies in the...