"The geometric growth rate of humans is unprecedented and never in the history of the earth has a single species grown to such bloated proportions, completely out of balance with living systems. The problem is only worsening. On conservative estimates the human population is expected to swell upwards to 8-10 billion by 2050, and perhaps expand significantly by 2100. Human population growth represents a crisis of the highest order, but of course it is only one aspect of multiple crises -- including species extinction and climate change -- merging together in a perfect storm of catastrophe that forms the daunting challenges facing humanity in the Anthropocene."