Skeptics’ Arguments It’s the Sun. Solar Forcing.

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Presentation transcript:

Skeptics’ Arguments It’s the Sun

Solar Forcing

Radiative Forcing Estimates

Solar Forcing?

Radiative Forcing Estimates

IPCC, 2007 Fingerprint Analysis Black = Observed Gold = Human and Natural Forcings Blue = Only Natural Forcings

Skeptics’ Arguments It’s the Sun Natural Cycle

Ice Core Records

Source: Hansen, Clim. Change, 68, 269, Ice Core Records

Skeptics’ Arguments It’s the Sun Natural Cycle “Cooling”

US Temperature Record

Warming is Unequivocal

Source: Hansen, Clim. Change, 68, 269, Ice Core Records

Skeptics’ Arguments It’s the Sun Natural Cycle “Cooling” Others?

Bottom Line No credible alternative can explain the magnitude, time course, or spatial pattern of the warming that has actually occurred. Real debate has shifted from whether we are causing climate change to how severe its impacts will be and what we should do about it. Good sources: Naomi Oreskes’ Merchants of Doubt