Key Concepts of Chapter one

"As our ecological footprints grow, we are depleting and degrading more of the earth's natural capital."

This concept describes the way humans are effecting the earth's sustainability by wasting  the earth's natural resources.   As peoples' ecological footprints continue to grow, the earth's natural capital depreciates.

The key concept is interesting because it shows the different ways of life and culture that humans have and how that effects their ecological footprint.

"the U.S. per capita ecological footprint was about 4.5 times the average global footprint, and 12 times the average per capita footprint, and 12 times the average per capita footprint of the world's low-income countries."
This data points describes the vast difference between the global footprint of an American and a  citizen of a poor country. This is an interesting data point because if every citizen lived as Americans do, the world would not be able to provide enough resources for people to survive.