Conversation: Last month was the hottest May in terms of global surface temperature in a historical record that extends back 130 years, according to NASA, and with an El Nio forecast for the end of the year, we could see more records fall.
But there are some more hopeful signs about the longer term. CO2 emissions fell by about 12% in both USA and EU between 2007 and 2012, for reasons including the global recession, rising gas use and a shift to renewable energy sources. President Obamas recent announcement...