<P> A shutdown or slowdown of the thermohaline circulation is an effect of global warming on a major ocean circulation . </P> <P> Data from NASA in 2010 suggested that the Atlantic Meridional Overturning Circulation has not slowed down, but may have actually sped up slightly in the recent past . A 2015 study suggested' that the Gulf Stream has weakened by 15 - 20%' . </P> <P> Don Chambers from the University of South Florida College of Marine Science mentioned, "The major effect of a slowing AMOC is expected to be cooler winters and summers around the North Atlantic, and small regional increases in sea level on the North American coast ." James Hansen and Makiko Sato stated, </P> <P> AMOC slowdown that causes cooling ~ 1 ° C and perhaps affects weather patterns is very different from an AMOC shutdown that cools the North Atlantic several degrees Celsius; the latter would have dramatic effects on storms and be irreversible on the century time scale . </P>

When the conveyor belt ocean circulation stops winters in europe are much