250 feet (76 metres)

According to Dr.Joe Romm, climatologist, author and Climate Progress blogger, in the not so distant future we can expect sea level rise around 3-6 feet, but it doesn’t stop there. “It’s not like sea levels are going to rise 4 feet and stop,” Romm says. “What we are headed toward is an ice-free planet with sea level rise of 250 feet; all but 40 or 50 feet is unstoppable.”
Clean Houston, “Top Climate Scientists Warn Adaptation to Climate Change Can’t Wait” by Vicki Wolf, November 2011