IPCC estimates are always highly conservative and often do not account for positive feedback mechanisms. I believe the most recent report accounted for 0 feedba

IPCC estimates are always highly conservative and often do not account for positive feedback mechanisms. I believe the most recent report accounted for 0 feedback. The sea level is not constant around the world. An average increase of .6m would likely be about 1m in the Northeast including Boston, NYC, and DC and only about .3m on the pacific coast. Edit: And the .6m (if that is correct) is just the baseline. Even if that is the level 364 days a year, one storm surge on one day with all that additional volume can put the entire city out of business.