The crisis of our species’ existence

MUST READ: Financier Jeremy Grantham writes in Nature that soaring commodity prices reveal we are running out of critical resources. In particular, phosphate and potash use "must be drastically reduced in the next 20–40 years or we will begin to starve." The problems are exacerbated by climate change, which he calls "the crisis of our species' existence." He implores scientists to be brave, speak out, and even risk arrest.


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