Part of the Problem in the Human Degradation of the Life-Support

Part of the problem in the human degradation of the life-support system of the earth is our ignorance of how the earth works.To change our behavior we need to know

A) Natural capital matters because it supports the earth's life and our economics.
B) Our ecological footprints are immense and expanding rapidly
C) Ecological and climate change tipping points are irreversible and should never be crossed.
D) All of these.
E) None of these.