Global Footprint measures the impacts of human population, consumption and waste upon Earth's total 'biocapacity', or number of planets worth of natural resources needed to sustain our activities at current levels. What does Global Footprint measure?
1) The impacts of human population on Earth's biocapacity
2) The impacts of consumption on Earth's biocapacity
3) The impacts of waste on Earth's biocapacity
4) The impacts of human population, consumption, and waste on Earth's biocapacity