Greenpeace co-founder, Dr. Patrick Moore: “Al Gore said [that] because CO2 and temperature is so strongly correlated, CO2 must be the cause of the temperature increase. Al Gore had it exactly backwards. There’s an 800 year lag between the temperature changing and the CO2 changing, and the effect never comes before the cause.”
Full talk: https://www.youtube.com/watch?v=lX1z_6pvM-Q