claim: Climate scientist James Hansen : we have until perhaps 50 years from now, or maybe a little longer and at that point, we are looking at 10, 20, 30 feet of sea-level rise.
evidence: According to the Fourth ( 2017 ) National Climate Assessment ( NCA ) of the United States it is very likely sea level will rise between 30 and 130 cm ( 1.0–4.3 feet ) in 2100 compared to the year 2000.