It's long been known that there's a very close correlation between Solar Magnetic Activity (Sunspots) and climate. This is the best introduction to the subject that I've seen.
This is science that the Scientific Community is not interested in pursuing, perhaps because there are no financial grants to be had by saying that an increased Government control of the economy won't Save The Earth™. The film actually shows this is gory detail, as Scientists® confront Svensmark telling him that his experiment is "worthless" without giving a scientific reason why.
It also explains how Sagittarius killed the Dinosaurs. This is long time-scales science. And this is brutal:
OK, then. But if you actually want to, you know, understand the science (as opposed to The Science®), then this is must-see Borepatch TV. And read the links. The next time that some smarmy Prog Bastard sneers that "the Scienciness™ is settled", ask him about the Svenskmark Hypothesis and it's scientific strengths and weaknesses. And then stand back and enjoy him squirming.
And if you really want to twist the knife, let him run down and then turn to someone else and say "He doesn't know."