Question of the Week: What is the best way to reduce fossil fuel use?

Each week we ask a question related to the environment. Please let us know your thoughts as comments. Feel free to respond to earlier comments or post new ideas. Previous questions.

Many energy alternatives to fossil fuels have been suggested – nuclear, solar, wind, geothermal, biofuels, conservation, etc. Each source of energy has benefits and challenges.

What is the best way to reduce fossil fuel use?