he residential sector contributes over 20% of energy-related carbon dioxide emissions in the U.S. In an Environment article published two years ago, Gardner and Stern identified a short list of the 27 most effective actions U.S. households could take to decrease their contributions to climate change, suggesting that altering the selection and use of everyday technologies could reduce household energy consumption by nearly 30%. Examples include tuning up the car twice a year, replacing incandescent light bulbs with compact fluorescent bulbs (CFLs), and installing more efficient air conditioning and heating units.

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