"Despite the apparent stress that humanity is causing to the Earth system, defining sustainable limits for our own existence has proved to be something of an intractable problem. But what if we could define global sustainability numerically? In this issue of Nature, a group of renowned earth system and environmental scientists led by Johan Rockström of the Stockholm Resilience Centre make a first attempt at estimating boundaries for the biophysical processes that determine the Earth’s capacity for self-regulation."
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