Greenland will lose trillions of tons of ice between now and the year 2400. cnn's chief climate correspondent bill weir spoke with one of the an authorizes of the report last year, william colgan, listen to how he described it. >> you think as long as i don't live within 20 feet of the sea, i'll be fine. that would be the first level of thinking it's not a big issue. but that rate of sea level change, how fast it's going to happen, it will be really hard to adapt to change that fast. >> and joining me now, as we stand near the atlantic, or in the atlantic in some caseses right before us is bil...