Antarctic currents, which supply 40% of the world’s deep oceans with nutrients and oxygen, are slowing dramatically. These deep ocean tides supply nearly half the world’s oceans with vital nutrients and oxygen, but melting ice shelves are slowing them. Currents in the Atlantic Ocean are also weakening — which could make the climate in some regions unrecognizable. And a newly discovered body of water called Atlantic Equatorial Water stretches from Brazil to West Africa.