Newly-Released Study Vastly Underestimates The ‘Worst-Case Scenario’ For Sea Level Rise

The worst-case scenario for sea level rise is 6 feet (1.8 meters) by 2100, according to a new study. Unfortunately, this study is already out of date because it is based on expert opinion from back in 2012.

This year, however, we’ve seen multiple bombshell studies on the growing prospect for West Antarctic Ice Sheet collapse — and similar findings that “Greenland will be far greater contributor to sea rise than expected.”

Even so, the plausible worst-case is important to understand because it is what should drive planning and “adaptation.” Also, avoiding the worst-case is typically a driving force behind prevention measures (people quit smoking because it might kill them or cause cancer) — in this case, slashing carbon pollution.

In fact, as the study points out, given a sufficient level of risk of high climate impacts, “no cost of mitigation is too high to justify.” Significantly, as the news release for the study notes, the major Fifth Assessment report (AR5) of the U.N.’s Intergovernmental Panel on Climate Change (IPCC) “was not able to come up with an upper limit for sea level rise within this century.”

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