<P> Endangered marine species include the manatee, seals, sea lions, turtles, and whales . Drift net fishing can kill dolphins, albatrosses and other seabirds (petrels, auks), hastening the fish stock decline and contributing to international disputes . Municipal pollution comes from the eastern United States, southern Brazil, and eastern Argentina; oil pollution in the Caribbean Sea, Gulf of Mexico, Lake Maracaibo, Mediterranean Sea, and North Sea; and industrial waste and municipal sewage pollution in the Baltic Sea, North Sea, and Mediterranean Sea . </P> <P> North Atlantic hurricane activity has increased over past decades because of increased sea surface temperature (SST) at tropical latitudes, changes that can be attributed to either the natural Atlantic Multidecadal Oscillation (AMO) or to anthropogenic climate change . A 2005 report indicated that the Atlantic meridional overturning circulation (AMOC) slowed down by 30% between 1957 and 2004 . If the AMO were responsible for SST variability, the AMOC would have increased in strength, which is apparently not the case . Furthermore, it is clear from statistical analyses of annual tropical cyclones that these changes do not display multidecadal cyclicity . Therefore, these changes in SST must be caused by human activities . </P> <P> The ocean mixed layer plays an important role heat storage over seasonal and decadal time - scales, whereas deeper layers are affected over millennia and has a heat capacity about 50 times that of the mixed layer . This heat uptake provides a time - lag for climate change but it also results in a thermal expansion of the oceans which contribute to sea - level rise . 21st century global warming will probably result in an equilibrium sea - level rise five times greater than today, whilst melting of glaciers, including that of the Greenland ice - sheet, expected to have virtually no effect during the 21st century, will probably result in a sea - level rise of 3--6 m over a millennium . </P> <P> On 7 June 2006, Florida's wildlife commission voted to take the manatee off the state's endangered species list . Some environmentalists worry that this could erode safeguards for the popular sea creature . </P>

Where did the atlantic ocean floor come from