Are we pushing the planet to brink of irreversible change?

Scientific American: Roughly 10,000 years ago, the great sheets of ice that had covered much of the planet receded, triggering a wave of extinctions, ecological changes and, ultimately, the rise of human civilization. All those changes came about as roughly 30 percent of the planet's surface went from ice-covered to ice-free. Since then, humans have transformed roughly 43 percent of the planet's surface to suit our need for food and shelter. Think: agriculture and cities. Now scientists suggest that our ongoing......

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