Quote Originally Posted by Dreadnaught View Post
I think it's a huge range based on very variable and difficult-to-observe variables. The landmass is somewhat speculative given how difficult it is to survey land beneath that much ice. Plus there have been some observations of massive sub-glacial lakes in Antarctica.

My point is not to deny that this may be a problem, but emphasize that it only *may* be a problem. Which doesn't preclude us preparing in various ways.
not knowing how much will melt is not the same as not knowing how much is there. I think they've used some very sophisticated satellite imaging and penetrating radar to get an excellent estimate of how much ice there is.