People who deny the existence of (anthropogenic) climate change

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People who deny the existence of (anthropogenic) climate change like to point out that CO2 emissions made by man are less than 1% of CO2 released by volcanoes and if that were true, it would more or less be the final nail in the coffin of man-made climate change. The fact of the matter is that the logic these people are employing is fine, it's just that their claim about volcanoes producing more CO2 than humans is simply incorrect! In other words their theory is fine but their data is way, way off.
What are some other examples of people misusing science that isn't pseudoscience, but rather dramatically misinterpreted or simply incorrect data?