Install a Low-Flow Showerhead
•Since using less water in the shower means less energy is used to heat the water, using a low-flow showerhead could save $150 and 350 lbs. of carbon dioxide a year.  (And, save money on your water bill as well.)
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Low-flow showerheads cost as little as $10, are easy to install and can reduce your shower flow from as much as seven gallons per minute to as little as two without making your shower less pleasurable.