Available statistics allow an analysis of carbon emissions by broad type of economic activity.
Currently, the only renewable energy source which contributes a meaningful portion of the nation’s and Massachusetts energy supply is hydropower.
About 1/3 of the United States total energy consumption of approximately 100 quadrillion BTUs (“quads”) is imported, up from less than 1/5 in 1973. Most of our net imports were petroleum. We import roughly 2/3 of our petroleum consumption.
Roughly 40% of carbon emissions are under direct individual control — half from transportation and half from electricity and heating in the home (as a nationwide average). An additional few points can be controlled by diet changes.
Pursuant to the Global Warming Solutions Act, the Massachusetts Department of Environmental Protection has begun to produce Massachusetts Greenhouse Gas estimates which appear to be authoritative.
Links to online calculators and key numbers for personal carbon budget analysis.