Antarctica’s melting, seas will rise: here’s why

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How is Antarctica melting? Much faster than we hoped, according to the latest research — neatly explained in the latest Peter Sinclair This Is Not Cool video for Yale Climate Connections (formerly the Yale Forum), cunningly titled Meltwater Pulse 2b. Just how fast the West Antarctic Ice Sheet will melt, and how much East Antarctica will contribute to near term sea level rise is open an open question, but the news is not good, as the latest research on the stability of the Antarctic ice sheet at the end of the last ice age suggests.

Climate Change and the Course of Global History

The title in the Kindle Store was irresistible: Climate Change and the Course of Global History: A Rough Journey. American historian John L Brooke is the author, and the book is notable for its attempt to integrate climate science with the study of human history. In his acknowledgements the author brackets climate scientists with historians and archaeologists in the long list of people with whom he has corresponded and from whom he has received data and an understanding of scientific culture.

The scope of the book is as wide as human emergence in the evolutionary process, and before. It’s not my purpose to track through the long story the author has to tell or to follow the intricacies of the climate shifts he refers to. The book demands and rewards patient reading in these respects. But I offer a few comments arising from my reading of the book.

An historian making the effort to understand climate science as thoroughly as Brooke does seems to me in itself worth remarking. Often I could have been reading one of the many books by scientists or science writers that I’ve reviewed over past years on Hot Topic. The culture gap between the sciences and the humanities that C P Snow’s famous 1959 lecture lamented was certainly not evident in Brooke’s history. Five years ago I reported the plea of biographer Richard Holmes at the Hay Festival that we reject the notion of two cultures and accept the duty to understand the scientific discoveries of the modern age, a duty of crucial importance in the face of global warming. Brooke has clearly accepted that duty, though I fear many educated in the humanities continue to excuse themselves from it.

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Cosmos, climate change, and walking the dog

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This Sunday the National Geographic Channel’s excellent Cosmos science series explores climate change (Sunday June 1st at 7-30pm NZ/Aus on Sky channel 72). In the excerpt above, astrophysicist Neil deGrasse Tyson explains the difference between climate and weather by talking a chocolate Labrador for a walk on the beach. The series has been attracting big audiences in the US, and the episodes I’ve caught have made compelling watching. It’s a reworking of Carl Sagan’s classic 1980 series, with wonderful graphics and great storytelling by Tyson. Highly recommended. And remember, watch the man, not the dog. (Hat tip to Chris Mooney at Mother Jones).

TDB today: Goodbye coastline – we are beyond the point of no return

In which I pull together the strands of the recent bad news from Antarctica and Greenland, and lament the loss of the coastline we all grew up with — no longer a theoretical possibility but a long term certainty. Check out Goodbye coastline – we are beyond the point of no return, this week’s post at The Daily Blog, and start planning for all our watery futures.

PIG and pals pass point of no return – West Antarctic ice melt inevitable

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Two new papers published this week suggest that the West Antarctic glaciers draining into the Amundsen Sea — the Pine Island, Thwaites, Haynes, Pope, Smith and Kohler glaciers — are melting rapidly and are now committed to collapse, adding up to 1.2 metres to future sea level rise. In the NASA JPL video above, Eric Rignot, lead author of a paper ((E. Rignot, J. Mouginot, M. Morlighem, H. Seroussi, B. Scheuchl. Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith and Kohler glaciers, West Antarctica from 1992 to 2011. Geophysical Research Letters, 2014; DOI: 10.1002/2014GL060140)) examining how the glaciers’ “grounding lines” — the point where the bottom of the glacial ice leaves the bedrock and starts to float — have retreated very significantly over the last 20 years explains how they are now melting back unstoppably. Another paper modelling ice loss from the Thwaites glacier ((Ian Joughin, Benjamin E. Smith, Brooke Medley. Marine Ice Sheet Collapse Potentially Underway for the Thwaites Glacier Basin, West Antarctica, Science, DOI: 10.1126/science.1249055.)) finds that it is committed to retreat and collapse via the same mechanism. Lead author Ian Joughin of the University of Washington, told Science magazine:

The next stable state for the West Antarctic Ice Sheet might be no ice sheet at all…

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