The Earth Policy Institute is an independent, nonprofit environmental research organization. It is dedicated to planning a sustainable future as well as providing a roadmap of how to get there. Its president is Lester Brown.
It has a number of datasets available here.
They have a number of plans of action, called Plan B. The overriding Plan B goals are to:
stabilize climate
stabilize population
eradicate poverty
restore the earth’s damaged ecosystems
Their latest publications is World on the Edge.