It has been the work of over 1300 scientists for 5 years.
You can download and review the Millennium Ecosystem Assessment report. The entire report is quite long, but at least look at the shortened summary:
"Living Beyond Our Means: Natural Assets and Human Well-being" (Statement of the MA Board).
Visit the website of the Millennium Ecosystem Assessment
You are urged to read this and to determine how each of us can be better stewards armed with this information.
There is so much that could depress us, but we can take this information and actually make changes in our practices!