The document discusses ecological footprints and human impacts on the environment. It provides data on the approximate ecological footprints of different countries in 2003. The United States had the largest footprint at 10.3 hectares per person, while India had the smallest at 0.8 hectares per person. An ecological footprint is the area of land and water required to sustain the resources consumed and waste produced by a human population. Countries with footprints greater than their available land area are considered to be living unsustainably.