You should put on a sweater if you're cold. You can lower your utility bills and reduce your carbon footprint. What could be better than that?
Thrifty behavior and environmentally friendly behavior are frequently one and the same. Compact fluorescent bulbs save money over their lifetimes even though they require a slightly larger initial outlay. Better home insulation lowers heating and cooling bills. Water heater blankets and shorter showers will reduce your bills as well. Beans and rice are far cheaper than meat. Thrift store and yard sale shopping mean you sometimes can get an entire outfit for a couple of bucks, and nothing new had to be manufactured to satisfy your desires. The list could go on and on. Please, consider whether a few small changes could help both your pocketbook and your planet.