Not only do gardens help with your carbon footprint but they also provide good free food and a hobby to do in spare time. Instead of going to the store everyday and spending money to buy one use items and kill the earth with your carbon contribution, you can stay in your backyard and created delicious food of your own. Simply stated, gardens reduce the amount of one use items and carbon emitters purchased and destroyed. "Gardening" the book talks about all the foods that you can create in your backyard, and even how to cook them. There are so many possibilities for gardens that are way better than CO2 emitting options that it is almost a no brainer. There are obviously disadvantages though, time management, lack of garden knowledge, and space or materials, to be considered but this is your choice.