Top Ten Ways to Be Green

Tip #6: Drive Less

A daily car commute of 20 miles round trip can add up to more than $2,000 per year, parking not included. If you work in an office, ask the HR department about any carpooling hookups and free or deeply discounted bus, train or subway passes; check your city's website for relevant routes. (Use the commute to read up on peak oil theory.)

Better yet, buy a basket and some decent rain fenders for your bike and ride to the office -- and to the post office, your dentist appointment, the grocery store. Sure, you can't fit as much on a bike as in a car, but shopping more often means fresher produce, thus tastier meals -- which you'll need after burning all those calories.

Replacing even one or two car trips a week will trim your fuel bill (and probably your waistline), but driving smarter can also help. Combine multiple errands into one trip, frequent nearby shops, and try to group your family's appointments together. Think about the most efficient route before heading out, and try to avoid busier traffic times.