So it is increasing still just a small amount. The last ice age was about 11F degrees colder then now and that caused most of the earth to be ice so why wouldn't heat have a strong effect too?
20,000 years ago New York City Central Park was covered with 15,000 feet of polar ice cap. That is settled science. Exposed boulders in Central Park bear glacial striations. Are you saying that it all melted because cave men were driving Hummers?