No, Gore merely made a movie that a lot of people saw, the politicisation (in the sense of wilfully ignoring science results for partisan reasons) was started in the 1990's by oil companies and republicans looking to kill they Kyoto protocol.

You can say so only if you believe that reality is constructed, like some French postmodernist philosophers do.

If you think there is some ground truth in hard sciences, and science community provides best approximation of it, then "other side too" argument is not valid. Al Gore educated, only climate dentists politicized.