In the year 2004, the

Go to Figure 4B [1]
Links:
[1] http://www.pewclimate.org/global-warming-basics/facts_and_figures/us_emissions/usghgemsector.cfm
[2] http://www.pewclimate.org/global-warming-basics/facts_and_figures/us_emissions
[3] http://www.pewclimate.org/global-warming-basics/facts_and_figures