This drop has occurred in the past 12 months. Note please that the latest sunspot cycle started 6 months late, and late sunspot cycles are associated with colder climate.
Here's a link to a more detailed discussion of the issue.
Apparently the four major temperature anomaly tracks show sharp drops in the anomaly over the past year. GISS is not the only one.
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In the same vein, we have this bit about disposing of all the compact flourescent bulbs that the new law is going to make us buy. *sigh*
300 million CF bulbs were sold in the US last year. Assume 5 mg of mercury per bulb. That's 1,500 kilograms of mercury which will have to be somehow diverted from landfills, etc, lest it pollute the environment. Okay? That's 1.5 long tons of mercury. And that doesn't even represent all the CF bulbs which will be sold before their use is mandated in 2012, nor does it represent a fraction of all the flourescent bulbs already in service.
Of course, the eco-nuts who demanded this crap think that all they have to do is pass a law forcing manufacturers of the things to recycle them "for free", and that'll take care of it. Well, it won't. What it will do is drive up the price of CF bulbs and drive some manufacturers out of the business, thus reducing choice and increasing prices.
Furthermore, it'll probably become illegal to dispose of your CF bulb in the trash. Do so, and the EPA will put you into the federal pen for God knows how long. *sigh*
I really hope this nonsense is rescinded before 2012.