That doesn't work. You haven't mentioned anything about how much CO2 there is in the atmosphere and how it got there, and when. Just because CO2 is a greenhous

That doesn't work. You haven't mentioned anything about how much CO2 there is in the atmosphere and how it got there, and when. Just because CO2 is a greenhouse gas, it doesn't mean it is _the_ greenhouse gas, or even the main climate change culprit. Some climate change deniers are specifically anthropogenic climate change deniers. They don't argue against climate change happening, just against the idea that it has anything to do with human activity. Given that CO2 is soluble, the Ocean absorption question remains. One could still also claim that data on the atmospheric concentration of CO2 has been fabricated to fit the temperature data (or the other way around). Historic values can't be independently measured and verified. The closest you can get to that is looking at a variety of independent sources, and checking whether they correspond. That won't convince someone who believes that the so-called independent sources are in cahoots, or innocently republishing one another's results.