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So Al Gore has his CO2 and temperature graph and uses it to show that increased CO2 has historically raised temperatures.
Then the Great Global Warming Swindle uses the "same data"(?) to show that increasing temperatures actually raises CO2, not the other way around.
Who is right and how do you know ?
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My first google search attempt, typed 'temperature and CO2 link' and this is the 3rd link.
CO2 amplifies warming cycles
This does not prove that increased CO2 from anthropogenic (this means 'man-made' wooleygimp) sources is causing global warming, but it debunks the idea that the lag means anything.
Notice that they reference an article from a peer-reviewed scientific journal (they have a link at the end).