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Robert Constanza's team priced ecosystem services at about how much a year?

AUS$ 18 trillion
BUS$ 3 trillion
CUS$ 330 trillion
DUS$ 33 trillion
Answer & Solution
Correct answer: D. US$ 33 trillion
1. Global GNP was about US$ 18 trillion. 2. Ecosystem services were valued at US$ 33 trillion. 3. Soil formation accounts for about half. _Source: syllabus Biology, Chapter 14, Ecosystem._
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