Not believing in a particular scientific viewpoint does not mean one does not believe in science. Most of the great scientific discoveries were at one point contrary to the collective scientific wisdom, e.g. heliocentricity, evolution, quantum mechanics, relativity.
*Note: I'm not equating a lack of belief in AGW with relativity.
...and when presented with the weight of evidence, we accept reality and start to account for it. For instance, when we noticed that our refrigerants were busting a hole in our house, with strong political will we stopped making them, and today the ozone layer is recovering.
Imagine if Reagan had torpedoed the Montreal Protocol. That's what we're talking about here.
Not really, since he denies global warming: https://youtu.be/CoxxGhLFbw4?t=2m25s