Agence France-Presse: Carbon dioxide emissions, the main driver of global warming, could fall three percent worldwide in 2009 due to the global economic crisis, the International Energy Agency said Tuesday. This would be the steepest drop in CO2 emissions for 40 years, chief IEA economist Fatih Birol said at a press conference in Bangkok, adding that the average annual growth in global carbon output until now has been three percent. Birol said this silver-lining drop in carbon pollution was a …