I signed up immediately after reading the press release. It just takes a few minutes out of your busy day to take the initial quiz. After that, you'll be directed towards week 1's topic: transportation. The page offers some tips on saving gas and suggestions for air travel such as purchasing carbon offsets through companies like TerraPass or Native Energy. Make sure to check it out and keep in mind that the first 500 people to complete the challenge will receive a free Slate/Treehugger Green Challenge t-shirt.