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"Once our personal connection to what is wrong becomes clear, then we have to choose: we can go on as before, recognizing our dishonesty and living with it the best we can, or we can begin the effort the change the way we think and live." - Wendell Berry
Even if this numbers are off the slightly the fact still remains that we are a species who can move moutains and change entire eco-systems. Its dangerous because we give little about the consequences of these actions. It took the earth a long time to build balance habitats, who are we to destroy all that hard work.
"Sustainability creates and maintains the conditions under which humans and nature can exist in productive harmony. Sustainable development is necessary to meet the needs of the present without compromising the ability of future generations to meet their own needs."