How much difference can individuals make by changing their daily direct energy consumption decisions — travel, electricity, home heating? * 1 comment
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.
The 20% half from heating and electricity in the residential sector appears in another post.
The transportation sector is harder to allocate to personal consumption. From Table 3-7 in the new EPA inventory of all greenhouse gas emissions, we have for 2005, the following breakdown of CO2 emissions from fossil fuel consumption in the transportation sector:
| Passenger Cars | 32.2% |
| Light-Duty Trucks | 28.8% |
| Other Trucks | 20.1% |
| Buses | 0.8% |
| Aircraft | 9.8% |
| Ships and Boats | 3.4% |
| Locomotives | 2.6% |
| Motorcycles, other | 2.3% |
A similar breakdown is available in Bureau of Transportation Statistics, National Transportation Statistics, Table 4-6 (a table compiling multiple sources for fuel consumption by different types of vehicles which doesn’t quite foot to the MER for total energy consumed in the transportation sector – lower by about 5%). See also the Environmental Defense Fund’s study of the rolling stock, EPA’s computations of emissions per mile for different vehicles, and the Oak Ridge National Laboratory’s Transportation Energy Data Book.
Considering each of these categories, and even if all car and light-duty truck use were personal use, it appears reasonable to attribute no more than 2/3 of total transportation energy consumption to personal, as opposed to business use — i.e., under 2/3 of the approximately 30% of U.S. carbon emissions that derive from transportation are personal — 20% of the U.S. total.
[...] approximately 81% of the 17.7 total — 14.4 tons of CO2 alone. And, as detailed in the another post , roughly 60% of the carbon emissions are from commerce and industry, so, for a personal Kyoto [...]