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But if the models are inaccurate, what if they are inaccurate in the optimistic direction?

That’s how error bars work and why they are indicated as +/-

Because the evidence doesn't point that way, and it's very expensive to make such an assumption, especially when much of the rest of the world doesn't follow.

I dunno... it's expensive in the short term but you end up with an energy infrastructure that makes you energy independent and where costs will only go down over time since solar/wind/batteries are all on a Moore's law like cost trajectory.

Fossil fuels meanwhile will on average only get more expensive over time because they are being depleted, and this isn't considering other externalities besides CO2 emissions.

There are reasons besides climate change to get off fossil fuel.

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