Yep - fun with math! Gallons of oil to barrels of oil to MMBTU's per barrel to MMBTU's per house per year (source energy vs. site energy). We totally geeked out on this. Minus points though for skipping the energy content in the natural gas that's leaking out of the well (apparently it's half and half). But our algebra skills reached a limit at some point once we felt like the point was made...
Don't forget, you're not off the hook if your home is heated with natural gas or electricity. This post makes the great point that energy is energy... No matter what it's made from (at least among the fossil fuels). The less coal and gas we use, the lower the demand for oil there will be.
I made the jump from online advertising to clean tech. It was not easy to re-start my professional network and learn all the new domain knowledge, but it paid off in being able to work in an industry that I really care about.