Here's the thing, like all3 said there's a very slim chance that anyone on this site can begin to understand climatology, But like Taint said, better safe than sorry. I have no idea the impact that humans have on the climate, but when I drive into Atlanta it's filled with pollution. There's no way that is good for our environment, so this leads me to believe that humans do have a pretty large effect on the climate.
A problem both sides run into are with extremists. The right has there group that says "climate change is a farce." Let's be real. Climate change is real. The causes and impact are up for debate, but it's real. The left has their extremists also that are hurting the cause. California is a great example of this. Both sides need to use some common sense on the issue.