A Brazilian call for a climate equity metric faces significant opposition from the U.S. and the European Union. At the Warsaw Climate Change Conference—which began on November 11th and will last for two weeks—Brazil proposed a program whereby nations would calculate their total output of greenhouse gases since 1850 in order to determine their responsibility for climate change. The proposal, which was supported by 130 nations, would focus attention away from China and India—two major emitters—and onto wealthier countries that have emitted carbon dioxide since the industrial revolution. In addition to the U.S., Norway, Switzerland, Canada, Australia, New Zealand, and Israel have voiced opposition to Brazil’s plan, believing that the proposal would give some countries leave to take on climate change less aggressively than they otherwise would. Many developing countries, however, emphasize that current climate change was caused by historical emissions of greenhouse gases—for which wealthier countries hold primary responsibility. Envoys hope to develop a legally binding treaty to fight climate change by 2015. For the full story, see http://www.bloomberg.com/news/2013-11-15/u-s-eu-reject-brazilian-call-for-climate-equity-metric.html.