Right now we’re consuming 40 percent of the planet’s primary productivity. That’s a dangerously high number. What’s the tipping point? Perhaps 45 percent could be enough to start a catastrophic loss of biodiversity from which our ecosystems cannot recover. Perhaps it’s 60 percent. No one knows for sure. What is known is that unless we figure out how to better the system and lower our impacts, then, with our ever-burgeoning population, we have little hope of a sustainable future.
