In the U.S. 40 percent of all urban trips are less than two miles, but 90 percent of those trips are made by car. GOOD Magazine, along with CLIF Bar, has introduced the Two Mile Challenge to try and get more people to make those short trips on their bicycle. To further that effort, the magazine has offered up the GOOD Guide to Biking for the Planet, which has a lot of helpful information on biking.
"Don't just run your errands—bike them! If you consider that each mile you travel by bike instead of car prevents one pound of carbon dioxide emissions from entering the atmosphere, the benefit of bike riding becomes clear."