Rising sea levels will threaten three times more people in the next 30 years than previously thought, according to the latest scientific estimates. Among the hundreds of millions of people worldwide facing the threat are the 400 residents of Newtok, Alaska. Rising river and eroding land is pushing the entire community to relocate, despite emotional and logistical hurdles.

Local reports on the big storm system hitting northern and western Alaska.

It was 20 years coming, but it finaly began this weekend: the first residents of Mertarvik moved into their new homes.