Answer:
US citizens would require about 5.0 earths to sustain themselves
Step-by-step explanation:
Ecological Footprint measures the human demand of earth, in terms of resources. In short, it measures the human impact on the environment. These footprints and biological capacity can be compared with nations, individuals, etc. U.S.A ranks 5th in terms of ecological footprint per person i.e 8.22 gha as of 2012 as any gha above 1.73 is considered as unstable for sustainable development. More than 85% of humanity lives in the world that is run out from ecological footprint capacity.