It is not a matter of a personal belief system.
For a long time I have stayed on the sidelines, as I knew there were a lot of questions about the issue.
Over time though, I could not ignore the questions raised about how emissions could not be harmful.
And here lately, the science is showing a conclusive result that I can not dispute.
So it is not a matter of "believe", it is a matter of accepting the facts that are being presented.
Until I see facts otherwise, then I have to be on the side of those that say man is contributing to climate change, and co2 appears to be the main source.