Much is riding on the United Nations Rio+20 summit. Many are billing it as Plan A for Planet Earth and want leaders bound to a single international agreement to protect our life-support system and prevent a global humanitarian crisis.
Inaction in Rio would be disastrous, but a single international agreement would be a grave mistake. We cannot rely on singular global policies to solve the problem of managing our common resources: the oceans, atmosphere, forests, waterways, and rich diversity of life that combine to create the right conditions for life, including seven billion humans, to thrive.
We have never had to deal with problems of the scale facing today’s globally interconnected society. No one knows for sure what will work, so it is important to build a system that can evolve and adapt rapidly.