Global Warming?

The main issue concerning global warming is if it is truly happening or not.  Many people believe that global warming is a myth and that at certain periods the world goes through these types of changes.  Other people believe that the polar ice caps are melting and this occurrence will eventually flood different areas around the world.  In week 3 of my class, we were asked to melt ice cubes in water using a cup to see what happened to the volume of water.  Not thinking about the principle of displacement, I immediately thought that it would spill out of the cup.  This of course did not happen. From what I could see the water volume stayed the same.  This again was because of water displacement. Unfortunately, I cannot use this experiment to conclude about the affects of global warming because I think there are other factors to consider.