Struggling with high energy bills? Your home water heater could be the culprit, as it accounts for approximately 14 percent of your energy usage. If your gas water heater is more than 10 years old, you might consider replacing it. A water heater that old might be operating at less than 50 percent efficiency! Consider replacing it with an energy-efficient tank or a heater without a tank, which warms up water only when you need it.

For more ways to reduce your carbon emissions and your bills, head over to The Slate Green Challenge with Treehugger. Almost 30,000 readers have pledged to reduce their collective emissions by 20 percent. After you take the initial carbon footprint quiz, we will provide you with information that ranges from transportation to holiday shopping and ways to reduce your impact through each of these activities. The first 500 lucky challengers will walk away with a new t-shirt from our friends and sponsors at I’m Organic. ::Slate Green Challenge Welcome ::Slate Green Challenge Week 7: Water

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