New doomsday map shows planet's dire state

Human activities have already pushed the Earth beyond three of the planet’s biophysical thresholds, with consequences that are detrimental or even catastrophic for large parts of the world, conclude 29 European, Australian and U.S. scientists in an article in Nature. This force has given rise to a new era – Anthropocene – in which human actions have become the main driver of global environmental change.

“On a finite planet, at some point, we will tip the vital resources we rely upon into irreversible decline if our consumption is not balanced with regenerative and sustainable activity,” says report co-author Sander van der Leeuw, of Arizona State University.

The report started with a fairly simple question: How much pressure can the Earth system take before it begins to crash? “Until now, the scientific community has not attempted to determine the limits of the Earth system’s stability in so many dimensions and make a proposal such as this. We are sending these ideas out to be vetted by the scientific community at large,” explains van der Leeuw.

Nine boundaries were identified in the report, including climate change, stratospheric ozone, land use change, freshwater use, biological diversity, ocean acidification, nitrogen and phosphorus inputs to the biosphere and oceans, aerosol loading and chemical pollution. The study suggests that three of these boundaries -climate change, biological diversity and nitrogen input to the biosphere – may already have been transgressed.

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