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To the IPCC: Forget about “30 years”

September 30, 2013

Watts Up With That?

IPCC has never waited for 30-year trends, and they were right.

Guest essay by Barry Brill

Under pressure at a media conference following release of its Summary for Policymakers, AR5 WG1 Co-Chair Thomas Stocker is reported to have said that “climate trends should not be considered for periods less than 30 years”.

Some have seen this as the beginning of an IPCC ploy to continue ignoring the 16-year-old temperature standstill for many years into the future. But even the IPCC must know that any such red herring is dead in the water:

1. When James Hansen launched the global warming scare in 1988, there had been no statistically significant warming over the previous 30 years and the warming trend during 1977-87 was 0.0°C. The IPCC was also established that year.

1977-1987_GISS

Source: Woodfortrees plot

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