By MOISES VELASQUEZ-MANOFF and JEREMY WHITE The warming atmosphere is causing an arm of the powerful Gulf Stream to weaken, some scientists fear. […] It’s one of the mightiest rivers you will never see, carrying some 30 times more water than all the world’s freshwater rivers combined. In the North Atlantic, one arm of the GulfContinue reading “In the Atlantic Ocean, Subtle Shifts Hint at Dramatic Dangers”