Probably is the lack of sunspots
NASA SOHO image shows a blank sun without sunspots, an indication of "solar minimum."
Also,
Now this 11-year low in Sunspot activity has raised fears among a small but growing number of scientists that rather than getting warmer, the Earth could possibly be about to return to another cooling period. The idea is especially intriguing considering that most of the world is in preparation for global warming.
Oleg Sorokhtin, a fellow of the Russian Academy of Natural Sciences believes that a lack of sunspots does indicate a coming cooling period based on certain past trends and early records. In fact, he calls manmade climate change "a drop in the bucket" compared to the fierce and abrupt cold that can potentially be brought on by inactive solar phases.[/b]
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