Climate Science Progress

1979

“US National Academy of Sciences report finds it highly credible that doubling CO2 will bring 1.5-4.5°C global warming.”

http://history.aip.org/climate/timeline.htm

2013

Effective Climate Sensitivity:

“ECS is likely between 1.5°C and 4.5°C”

IPCC AR5

Likely means 66% confident.

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