Did you know that turning your thermostat down just five degrees can cut energy bills by up to 10 percent? Or that every 100 pounds you carry in your car lowers its fuel economy by 1 to 2 percent? So turn down the temperature and clean out that clutter!

These are just a few of the easy, innovative and wallet-friendly tips featured in our new Green Tips Library.

What better way to keep your Earth Day pact with mother earth than to adopt a cleaner, greener lifestyle. So check out the Green Tips Library, your one-stop-shop for easy green lifestyle tips.

All over America, communities are taking action to help solve global warming. From hybrid vehicle fleets in Charlotte, to green buildings in Austin, and homes powered with renewable energy in Seattle, local governments are moving forward with innovative energy solutions that curb global warming, save taxpayer dollars, and create healthier cities. Local leaders are moving America toward a safer and more secure future.

So what is a Cool City? These are cities that have made a commitment to stopping global warming by signing the U.S. Mayor's Climate Protection Agreement. The Cool Cities campaign helps cities turn their commitments into action by pushing for smart energy solutions.

To find out more, visit our Cool Cities page.

$25 Sierra Club membership with expedition pack.

Why join the Sierra Club? Because we need you! Your voice will be added to those of more than 750,000 of your fellow Americans who are committed to leave our children a living legacy - clean air, clean water, and natural grandeur.

Inspired by nature, we work together to protect our communities and the planet. So please -- join the Sierra Club and join the fight to protect the planet!