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Source: treehugger.com, "For even the most manic committed TreeHugger, doing the math and figuring out if a first (or yet another) green upgrade or remodel computes is a good idea. It's no secret that most "green" things carry a price premium, but many can pay for themselves with increased efficiency over time -- a concept known as "return on investment," or ROI.
While some things, like dishwashers and low-flow showerheads, can be easier to figure -- just compare your old model's water and energy consumption with the specs of a new, Energy Star-rated model alongside your water and energy costs -- other efficiency upgrades, like sealing the leaks in your heating ducts -- can be harder to figure. ..."
