Regardless of id it's our fault or not, it is foolish to think that the earth will never change and that we will be around forever.
The Millennium Ecosystem Assessment is one of the biggest scientific collaborations ever undertaken.
It finds that human activities have caused irreversible changes to the natural world.
Intensive farming is turning land barren and depleting water supplies, and these changes are severe enough to threaten the millennium development goals which include a commitment to halve world hunger by 2015.
The report also tries to put an economic cost on environmental degradation.