"... (W)e have become a geological force, the most prolific mammal on the planet, endowed with powerful technologies, impelled by an insatiable appetite for stuff, and supplied by a global economy. Taken together, our numbers, technology, consumption, and global economy have made us a new kind of force on the planet. For the first time, we must ask, “What is the collective impact of 6.8 billion human beings?” As we begin to answer that question, we are left with the extreme difficulty of responding to global threats that our own activity has caused."
"Many people harbour an understandable tendency to deny the reality of the crisis in the biosphere. After all, how can puny humans have such a massive impact on this large planet? Some also maintain a conceit that we can manage our way out of the mess, increasingly with heroic interventions of technology. But we’ve learned from past technologies – nuclear power, DDT, CFCs – that we don’t know enough about how the world works to anticipate and minimize unexpected consequences."
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