Here is an analogy. Consider you are in a tanning bed getting a suntan. When someone throws a cup of ice cubes on your back. Then closes the tanning bed with you inside so you can't move but the ice cubes on your back begin to melt and drift to other areas. The places they were dry up and new places are now colder. Eventually, all the ice will melt but you will still be cooking. So while certain places are colder you are warming up. Hence the word 'Global Warming.' The ice cubes can represent the ice caps, rising sea levels, hurricanes, snowstorms, etc.