There are those who dispute the reality of global warming. Scientific evidence is that it has been occurring based not just on rising average temperatures, but on solar output and carbon release from the oceans.
But I would like to state here that the vast majority of us who are accused of stupidly not "believing" in global warming do not generally dispute that it has occurred, is or recently has been occurring, and will occur in the future.
What is in dispute is whether mankind contributes significantly to this process, and if we do, how much we really do contribute and how much is within our control. I am against costly economic sanctions against certain industries until such a time as it can be definitively proved that mankind, out of all the times we know this has happened during the earth's long history, is this time responsible for a natural process.