Many institutions, organizations and governmental bodies are concerned with the issue of ecological footprint. Below is an example which gives many links to related litterature:
Global Footprint Network is an international think tank working to advance sustainability through use of the ecological footprint. Earth Overshoot Day is meant to be an annual marker of when we live beyond our means in a given year.
While only a rough estimate of time and resource trends, Earth Overshoot Day tries to measure the gap between our demand for ecological resources and services, and how much the planet can provide.