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We Had All Better Hope These Scientists Are Wrong About the Planet's Future (washingtonpost.com)
Less than 24 hours since we read this dire climate study, an anonymous reader writes from a Washington Post report about several more concerning things: James Hansen, a former NASA scientist, says his new study suggests the impact of global warming will be quicker and more catastrophic than generally envisioned. The research invokes collapsing ice sheets, violent megastorms and even the hurling of boulders by giant waves in its quest to suggest that even 2 degrees Celsius of global warming above pre-industrial levels would be far too much. Hansen has called it the most important work he has ever done. "I think almost everybody who is really familiar with both paleo and modern is now very concerned that we are approaching, if we have not passed, the points at which we have locked in really big changes for young people and future generations," Hansen said.
It's worth noting that this is just one paper, and some reservations about this paper have been expressed by peers:
Michael Mann, a Penn State university climate scientist familiar with the original study, commented, “Near as I can tell, the issues that caused me concern originally still remain in the revised manuscript. Namely, the projected amounts of meltwater seem unphysically large, and the ocean component of their model doesn’t resolve key wind-driven current systems (e.g. the Gulf Stream) which help transport heat poleward. That makes northern hemisphere temperatures in their study too sensitive to changes in the Atlantic meridional overturning ocean circulation,” the scientific name for the ocean circulation in the Atlantic that, the study suggests, could shut down.
However, another Penn State researcher, glaciologist Richard Alley, said by email that “though this is one paper, it usefully reminds us that large and rapid changes are possible, and it raises important research questions as to what those changes might mean if they were to occur. But, the paper does not include enough ice-sheet physics to tell us how much how rapidly is how likely.