reduce our co2 emissions

We are looking at adding on to our house and we are looking at making it more energy efficient. Sealing the house better and putting in better insulation will help with the heating bill. Our electricity is already from wind, so while we like the idea of rooftop solar, the net marginal benefit of it CO2 wise isn’t high, though it has obvious local benefits. Likely getting a hybrid would reduce CO2 emissions more, at less cost even factoring the spending over 30 years. My son really feels we should have a hybrid.

our electricity is now all from wind power. one source of co2 emissions down.