Article written by Robert Costanza about the economic value of ecosystems that contribute to human welfare, both directly and indirectly. In the article they estimate the current value of 17 ecosystems and 16 biomes. For the entire biosphere the value is averaged to 33 trillion dollars per year.
The Value of the World's Ecosystem Services and Natural Capital
Here is a summary report on the Economics of Ecosystems and Biodiversity. The report covers why ecosystems are economically important and why it makes sense to value them economically, reasons to invest in natural capital, and improving the distribution of costs and benefits.
Economics of Ecosystems and Biodiversity
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