Ecological footprint

In class we were given a website we could go to and take a quiz to see what our ecological footprint would be. It is crazy to believe that the avg. American would need 4-7 earths. I had my parents take the quiz so they could see our families ecological footprint and since then we are trying to cut back on somethings. it takes one step at a time. I just wish more Americans understood ways in which they could try and become more sustainable.