Coastal cities submerged?

New reports of glaciers melting could cause the earth's oceans to rise. By the end of this century the earth could be a possible 4 degrees warmer than it is now. I know this doesn't seem like much but for cities on costal areas look out. Let me know your thoughts on this topic. I have left two links if you desire to read more. http://today.reuters.com/news/newsarticle.aspx?type=topNews&storyid=2006-03-23T210520Z_01_N23329973_RTRUKOC_0_US-ENVIRONMENT-OCEANS.xml&rpc=22 http://www.sciam.com/article.cfm?chanID=sa003&articleID=0007FA05-10BC-1423-90BC83414B7F0000