A while back we featured
Fuel sources: Certainly your choice of energy source(s) can have a huge impact on the environment (and your pocketbook). For example, propane powered appliances can significantly reduce greenhouse gas emissions by as much as 70 percent ehn compared with electricity. Likewise, propane-powered storage water heaters will emit upwards of 35 percent less greenhouse gas than electric models.
Part 3 will feature Green Upgrades to save you money and help the environment.