the last 15 years of data show a discrepancy in the expected warming rate produced by gcm models. this is according to NOAA and the top climate modelers.
"Near-zero and even negative trends are common for intervals of a decade or less in the simulations, due to the model’s internal climate variability. The simulations rule out (at the 95% level) zero trends for intervals of 15 yr or more, suggesting that an observed absence of warming of this duration is needed to create a discrepancy with the expected present-day warming rate"
Edited by Little Fish, 08 December 2012 - 11:59 AM.