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Yes, the globe is warming. But how fast?
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| Contributor | ArmyDem |
| Last Edited | ArmyDem Jul 10, 2008 10:04am |
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| Category | Blog Entry |
| News Date | Tuesday, July 8, 2008 04:00:00 PM UTC0:0 |
| Description | In a world of complete knowledge, we could measure annual temperatures around the globe and then factor out all of the short-term changes not driven by human emissions. What’s left would be the anthropogenic or human-caused global warming trend.
In the real world, however, we don’t measure temperatures everywhere — we interpolate between temperature stations. And we don’t know the exact magnitude of all the short-term natural variability. That leaves plenty of room for global warming deniers and delayers to intermittently push their siren song of “global cooling” (see “Media enable denier spin: A (sort of) cold January doesn’t mean climate stopped warming“). And siren song it is (see “Hadley Center to delayers: We’re warming, not cooling” and “Hansen throws cold water on cooling climate claim” and “Breaking News: The Great Ice Age of 2008 is finally over — next stop Venus!“).
In this post, I will examine some of the factors that have affected recent temperature records (including changes in solar irradiation) to understand what is really going on. First, RealClimate’s Gavin Schmidt has extracted the the El Niño - Southern Oscillation (ENSO) signal from the global temperature data (both NASA’s and Hadley’s):
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