Gore is a tool.
My thoughts about Gore's opinions on science are the same as my thoughts on Rush Limbaugh's opinions on science.
The climate changes. How much effect do we have on that? No one really knows. Will what we drive change any of this in any meaningful way? I am skeptical.
Will the earth eventually get warm enough to melt the icecaps. No question. Heck, in a few billion years the earth will be engulfed by the sun (ask any astrophysicist).
Is it a good idea to burn less oil for geopolitical reasons? No question.