Robert Constanza and His Colleagues Have Shown That _______________

Multiple Choice

Robert Constanza and his colleagues have shown that _______________.

A) ecosystems services cannot be assigned monetary values because they are external
B) the value of ecosystem services is more than $48 trillion in 2013 dollars
C) NAFTA has had environmental benefits worth $2.7 billion in 2011
D) ecosystem services are valued at less than 0.5% of the U.S. GDP
E) nutrient cycling is the least valuable of ecosystem services