The United States has the highest land area per person needed to support their lifestyles. This is because the United States has a relatively small population compared to its land area, and because Americans consume a lot of resources per person. Americans consume more energy per person than any other country in the world, and they also produce more waste. As a result, the United States has a large ecological footprint. The ecological footprint is a measure of how much land and water is required to produce the resources that people consume and to absorb the waste that they produce.