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Bronco-Merkur t1_iudi474 wrote

Haven't we already entered a 4.0 C+ scenario?

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Splenda t1_iue628a wrote

No. Current pledges and forecasts have us on a 2-3C by 2100 trajectory.

However, the range of possibilities above 2C is very wide, and the ensemble models ignore a number of potential feedbacks that could change outcomes.

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Angeleno88 t1_iudsy5o wrote

Not guaranteed but it is realistic that various feedback loops and tipping points have already been reached that will lead to 4 degrees within a couple hundred years. That level of warming would destroy global human civilization as we know it. Even 3 degrees would likely have that result. We will hit 2 degrees between 2-4 decades depending on what actions we take going forward. This century will determine if we make it as a species.

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