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@guest: en.wikipedia.org/wiki/Scientific_opinion_on_climate_change has a bunch of references to studies on climate change. Five clicks from there is a "properly peer-reviewed, properly duplicated, properly confirmed, properly investigated" 1856 paper that "DEFINITIVELY and CAUSALLY links increased CO2 to planetary temperatures". If the scientific community could have falsified the greenhouse effect hypothesis in the last 150 years, it would have.