Comment Re:Climate "tipping points" are utter nonsense (Score 4, Insightful) 84
Show me any evidence whatsoever that this has happened in the past. And if there is none, show me the absolutely stunningly extraordinary evidence that it could possibly happen in the future. Make sure you explain how the Sun and the Earth will suddenly stop working the way they have been for billions upon billions of years.
They won't. Nobody's saying that Earth's core will stop spinning, or that plate tectonics will cease, or that the long-term glacial cycle will end. Geologically, Earth itself will be fine in the long run.
The concern is about biological ecosystems on the Earth, and their habitability for humans. The planet will keep ticking, but that's little comfort if humans are struggling to survive. We're at the top of a complex food chain, and disruptions to other species -- which are less adaptable than humans -- can have ripple effects that impact our ability to feed the world's population, or produce the resources we depend on for clothing and shelter. The concern about "tipping points" is things like rising temperatures causing permafrost to thaw, causing formerly-frozen biomass to decay and release greenhouse gases that raise temperatures further, thawing more permafrost. That sort of thing has the potential to become self-reinforcing if it starts.
Earth has had a lot of natural change over its billions of years, but that change includes multiple mass extinctions. We'd like to avoid pushing the biosphere toward another one much sooner than would otherwise happen naturally.