Sea levels this year posted a record high,making low-lying coastal population more vulnerable to extreme weather like super -storm Haiyan, UN officials said on November 13.In an interim report on the planet climate, the world Meteorological Organisation also estimated that 2013 was on course to be one of the hottest years since records began.The Philippines is reeling from the devastation wreaked by Typhoon Hai-yan the most powerful tropical cyclone ever to hit the country and one of the most intense ever recorded, agency chief Michel jarraud said.