The continued warming of the earth's climate is melting mountain glaciers and polar ice sheets and that's causing the world's oceans to rise -- slowly, but surely. Most scientists agree that sea levels could rise by more than one meter by the end of this century, and that could spell trouble for low-lying island nations and coastal cities around the world - such as New York. VOA's Bernard Shusman reports America's most populous city is studying ways to keep those rising waters at