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Franzen's essay displays some misunderstandings about what mainstream climate science expects.

He incorrectly describes the 2C "limit" that society has embraced as a goal thusly:

"Our atmosphere and oceans can absorb only so much heat before climate change, intensified by various feedback loops, spins completely out of control. The consensus among scientists and policy-makers is that we’ll pass this point of no return if the global mean temperature rises by more than two degrees Celsius (maybe a little more, but also maybe a little less)."

This is completely wrong. Mainstream climate science in no way suggests that the global climate will 'spin completely out of control' if we warm more than 2C.

Rather 2C max warming was adopted as a goal we should aim for because it's the point where scientists were confident that the harms of that warming would significantly outweigh the benefits, and so warming of 2C or more is judged 'dangerous' and something we should try to avoid. There is virtually NO expectation from mainstream science that above 2C we would expect uncontrollable feedback loops to kick in that would send the global climate completely out of control.

2C is NOT a 'point of no return'. Rather it is a level of warming that is dangerous to the world's societies in multiple ways, and so we should make serious effort to avoid warming that much.

However there's NOTHING that says we might not be able to limit the warming to 2.5C or even 3C, and then bring it back down under 2C at a later date and so limit the ongoing increasing damages that accrue at higher levels sustained for longer times.
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