Scientists: Human activity has pushed Earth beyond four of nine ‘planetary boundaries’

Clmate change: A severe drought plagued a third of Queensland, Australia in 2013. Destabilizing the global environment could make Earth less hospitable for humans. (David Gray/Reuters)
The paper contends that we have already crossed four “planetary boundaries.” They are the extinction rate; deforestation; the level of carbon dioxide in the atmosphere; and the flow of nitrogen and phosphorous (used on land as fertilizer) into the ocean.
“What the science has shown is that human activities — economic growth, technology, consumption — are destabilizing the global environment,” said Will Steffen, who holds appointments at the Australian National University and the Stockholm Resilience Center and is the lead author of the paper.
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