According to the latest studies on the subject, it is not all of the cars and other vehicles that are leaving such a huge unfavorable environmental footprint on our planet, and causing more greenhouse gases! But it is actually the number of buildings and houses, that leave the worst impact on our planet. Buildings are very wasteful of materials and energy, as well as more of the water that could be utilized for our drinking. If you decide that you would like to have an impact on this for good changes, then you can get your LEED AP, and start in a fabulous career.