A group of international
ecological1 scientists led by the University of Adelaide have rejected a doomsday-like
scenario2 of sudden, irreversible change to Earth's ecology. In a paper published February 28 in the journal Trends in Ecology and Evolution, the scientists from Australia, US and UK argue that global-scale ecological tipping points are unlikely and that ecological change over large areas seem to follow a more gradual, smooth pattern.
This opposes recent efforts to define 'planetary tipping points' ‒ critical levels of biodiversity loss or land-use change that would have global effect ‒ with important implications for science and policy-makers.
"This is good news because it says that we might avoid the doom-and-gloom scenario of
abrupt3, irreversible change," says Professor Barry
Brook4, lead author of the paper and Director of Climate Science at the University of Adelaide. "A focus on planetary tipping points may both distract from the vast ecological
transformations5 that have already occurred, and lead to unjustified
fatalism（宿命论） about the catastrophic effects of tipping points.
"An emphasis on a point of no return is not particularly helpful for bringing about the conservation action we need. We must continue to seek to reduce our impacts on the global ecology without
undue6 attention on trying to avoid
arbitrary（任意的） thresholds."
A tipping point occurs when an
ecosystem7 attribute such as species abundance or carbon sequestration responds rapidly and possibly irreversibly to a human pressure like land-use change or climate change.
Many local and regional-level
ecosystems8, such as lakes and
grasslands9, are known to behave this way. A planetary tipping point, the authors suggest, could theoretically occur if ecosystems across Earth respond in similar ways to the same human pressures, or if there are strong connections between continents that allow for rapid
diffusion10（扩散，传播） of impacts across the planet.
"These
criteria11, however, are very unlikely to be met in the real world," says Professor Brook. "First, ecosystems on different continents are not strongly connected. Second, the responses of ecosystems to human pressures like climate change or land-use change depend on local circumstances and will therefore differ between localities."
The scientists examined four principal drivers of terrestrial ecosystem change ‒ climate change, land-use change, habitat fragmentation and biodiversity loss ‒ and found they were unlikely to induce global tipping points.
Co-author Associate Professor Erle Ellis, University of Maryland, Baltimore County, says: "As much as four fifths of the
biosphere12 is today characterised by ecosystems that locally, over centuries and
millennia13, have undergone human-driven regime shifts of one or more kinds. Recognising this reality and seeking appropriate conservation efforts at local and regional levels might be a more fruitful way forward for ecology and global change science."
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