"It is based on facts and repeatable experiments that verify predictions."
But all human actions are socially based, so the reactions science, and the things studied, are socially based, as are some interpretations of the data.
I agree with #3. You have to look at all the things being said, and figure out what is the more likely obfuscation. To throw a monkey wrong in what he said, though, is that there really aren't that many climate scientists and some evidence of collusion and evidence control has come to light on both sides.
To argue the point further, we also know the state of the world, the depth of the oceans, average temperature, etc, from millions of years ago based on geological and fossil evidence. There were indeed times where the CO2 levels were much higher.