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So that's just the main event in Charlotte, Washington. So going back to the mid 1800s, the scientists already knew that CO2 was a main greenhouse gas. And they shared CO2 measurements with CO2 trapped in air but within ice. They showed that the gas had increased more than 40% from the 1800s to 2019. And all that and the different types of CO2, by and large, showed that it was a main greenhouse gas.