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Again, we've know that certain gases warm the planet. We've known this for centuries. We expected that unabated fossil fuel combustion, which releases those gases and those gases can accumulate in the atmosphere, should by properties of physics warm the planet. The planet is warming as should be expected. For it not to be warming would be very odd.
Not a new idea. Lots of data. Ice cores give us data for hundreds of thousands of years ago. There is a ton of cross checking of data with very reliable proxies.
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