One of the best ways to reduce your impact on the climate is to take a public bus, subway or train instead of driving. Since you don't have to keep your eyes on the road, you can read, talk with friends or listen to music while you travel. If just 10% of US passenger car travel was avoided in favor of mass transit, we would save 75 million tons of CO2. Give public transit a try for one trip a week to start. You may be surprised by how convenient reducing greenhouse gas emissions can be.