Simple fact: If we continue to release CO2 into the atmosphere, the atmosphere will get warmer. This was demonstrated way back in the 1850's by Foote and later Tyndall. CO2 concentrations have increased from 280ppm to 410ppm and we have seen clear evidence of warming. 1/8 We know humans are to blame for this increase due to the unique signature of isotopic carbon released from burning fossil fuels (C13/C12 ratio). 2/8