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The Six Scenarios:
[Species Collapse]
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[Biology Breach]


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Posted Sun Jul 7 2013: from Earth Institute:
Flashback from 2011: Have We Crossed Planetary Boundaries?
From 2011: "The boundaries delimit: climate change, ocean acidification, stratospheric ozone depletion, disruption of the nitrogen and phosphorus cycles, global freshwater use, land use changes, biodiversity loss, aerosol loading in the atmosphere, and chemical pollution. Many of these systems may react abruptly once a certain threshold is breached, so boundaries are set at a safe distance from the tipping points. Human beings have already crossed the boundaries for climate change, biodiversity loss, and interference with the nitrogen cycle; and we are fast approaching the boundaries for freshwater use, land use changes, ocean acidification, and interference with the global phosphorus cycle."...
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