Question : What is the amount of average price tag on nature's life support services determined by Robert Constanza and his colleagues?

Question : What is the amount of average price tag on nature's life su

1.	Question : What is the amount of average price tag on nature's life support services determined by Robert Constanza and his colleagues?
Answer» US $ 3 trillion a year US $ 13 trillion a year US $ 23 trillion a year US $ 33 trillion a year Answer :D