There lifestyle gets changed because it has to much heat and it melts their habitat. Harp seals have hard time surviving because of the hard hot climate is milting there habit. Also, it make's either an males that the harp seals eat dead and not survive. Harp seals try to find food but the ice melts to fast for them to get their food.
The baby seals get lost from their parents and cant get back to them because the ice melted when globe warming happens. Harp seals habitat melt so they don't have any where to live.
The harp seals lives in very cold arctic weather. the combination carbon and methane causing the earth to warm up. The accurate temperature is 30 c and 86 F.