"Even if every single person in the United States were to change all their light-bulbs to fluorescent, cut the amount they drive in half, recycle half of their household waste, inflate their tire pressure to increase gas mileage, use low flow shower heads and wash clothes in lower temperature water, adjusts their thermostats two degrees up or down depending on the season, and plant a tree, it would result in a one time, 21% reduction in carbon emissions."