Video: Arctic scientist says Icecaps are Melting: It is accelerating

The icecaps are melting and will be gone by 2030 if they melt at a constant rate, but they're not melting at a constant rate; they are accelerating, which means that they will be gone by "we don't know". The guy doesn't say when they will be gone by:
http://www.brightcove.tv/title.jsp?title=1219796154
I am afraid that it doesn't seem to sink into people's heads what that means.
Denial?