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Cooler North American temperatures in 2008 resulted from a strong natural effect, and the overall warming trend that has been observed since 1970 is likely to resume, according to university and NOAA scientists.
(I added the bold print)
“We found that North American coolness resulted from a strong bout of naturally caused cooling in the tropical and northeastern Pacific sea surface temperatures,” said Martin Hoerling, a NOAA meteorologist and co-author. “This illustrates how regional patterns can vary independent of the overall global average. In 2008, global land temperatures were the sixth warmest on record, whereas it was the coldest year in North America since 1996.”
Freezing temperatures have caused chaos across Europe