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A new study suggests that a million years ago, glaciers began sticking more persistently to their beds, triggering cycles of longer ice ages. Here, ice discharged from Iceland’s Breiðamerkurjökull glacier on its way to the Atlantic ocean. Credit: Kevin Krajick/Earth Institute Why did glacial cycles intensify a million years ago? Researchers find clues on the bed of the Atlantic Ocean. Something big happened to the planet about a million years ago. There was a major shift in the response of Earth’s climate system to variations in our orbit around the Sun. The shift is called the Mid-Pleistocene Transition. Before the...

Scientists are worried the Atlantic Meridional Overturning Circulation (AMOC), a "critical aquatic conveyer belt" that drives currents in the Atlantic Ocean, is at risk of near-complete collapse due to climate change, The Washington Post reports.A shutdown of the crucial circulation system could "bring extreme cold to Europe and parts of North America, raise sea levels along the U.S. East Coast, and disrupt seasonal monsoons that provide water to much of the world," the Post reports. The effects, in short, would be devastating."The mere possibility that the AMOC tipping point is close should be enough for us to take countermeasures," warns...

The alleged weakening of the Atlantic Meridional Overturning Circulation appears to be triggering a growing amount of speculation about abrupt cooling, like the plot of the movie “The Day After Tomorrow”.