Here are 10 great Earth Day ideas from the editors of Mother Earth News magazine. Accept our Earth Day Challenge ? share them with your friends and family.

1. CHOOSE AN EFFICIENT RIDE
by Bryan Welch, Publisher

Before you plunk down a lot of dough on a new hybrid car, consider whether a used motorcycle might be more fun and might get you more total miles per gallon. I love my 1988 BMW K75S. It cost me about $3,000 and gets about 60 miles per gallon. I can't ride it every day, but when I average it out with my car, my overall mpg is terrific!

2. SUSTAINABLE LAWN CARE (AND FREE ORGANIC FERTILIZER)
by Cheryl Long, Editor in Chief

Conventional American lawn care is about as unsustainable as you can get. First, people buy expensive fertilizer that makes the grass grow faster, which means they have to mow more often. Then they send the nutrient-rich grass clippings to the landfill, rather than leaving them to decompose and return nutrients to the soil. Plus, most people tend to mow their grass too short, making it easier for weeds to move in. Here's a better way: Fertilize sparingly if at all, leave the clippings on the lawn, and cut your grass high.

You can help further reduce the amount of yard waste sent to landfills by using the bags of clippings that your neighbors put out with their trash. The clippings are rich in nitrogen and other nutrients and make a great organic garden fertilizer (be sure they're herbicide-free). A 1- to 2-inch layer of fresh clippings applied once a year will provide plenty of slow-release nutrients for most crops. Plus, the clippings do double duty as a great mulch to prevent weeds and conserve soil moisture.

3. CHECK TIRE PRESSURE; IMPROVE FUEL ECONOMY
by John Rockhold, Managing Editor

One of the easiest ways to maximize your car's gas mileage ? and make a significant difference for the environment ? is to maintain the correct tire pressure. Seasonal temperature changes and normal wear and tear cause tires to lose pressure, which can cut fuel economy by up to 5 percent ? costing you an extra $50 to $100 a year, depending on your vehicle's mpg. If every American drove with properly inflated tires, we would annually save 1 to 2 billion gallons of gasoline and slash global warming emissions by as much as 20 million tons, according to the