Mongabay: Carbon dioxide emissions from fossil fuel use in the United States fell 2.8 percent in 2008, the largest annual drop in more than 20 years, reports the Energy Information Administration. A slowing economy and high gasoline prices contributed to the decline. Emissions fell for all major fossil fuels: emissions from petroleum fell 6 percent, natural gas dipped 1 percent, and coal retreated 1.1 percent. Emissions also fell across most end-use sectors including electricity …