Robert Costanza's research on ecosystem services found that ________.A) wetlands detoxify and purify water
B) actions taken from a conservation viewpoint actually serve ecosystems more efficiently than those from a preservation viewpoint
C) most ecosystem services can be replicated by humans, but materials like wood cannot be manufactured
D) ecosystem services provided by Earth's biosphere are worth more than goods and services created and provided by people
E) the value of ecosystem services has been overstated in the literature and should be valued at only 1/10 of the value generally accepted by economists