Carbon Emissions Calculators for Air Travel and for Buildings

At http://chooseclimate.org/flying, you can use the cute cursor to plot your trip, enter your aircraft type, class of service, passenger load factor, and get the results in fuel and GHG emissions. You can also find out how your trip compares to an annual budget for sustainable GHG emissions, that is, a global per capita average that is estimated to produce a stable climate. You will find out that GHG emissions in aircraft are roughly 3x as climate forcing as ground level emissions, partly because of where they are injected and partly because of the water vapor emitted.