Are we contributing to it?
Again, maybe only a little.
But the thing that many get confused about is, global warming isn't just the planet getting warmer. It is a plethora of over-the-top weather anomalies, like massive snow storms, enormous hurricanes, and record powerful tornado seasons, just to name a few. And these anomalies will occur more frequently and more powerfully than in the past.
Can we stop it? No. I don't think so. I think it is a natural galactic occurrence that happens to our planet on a regular basis. Granted that occurrence maybe every couple thousands of years or so.
But is man adding heat to this fire? I think on a global scale maybe...maybe a little, but I think all the crap we shoot into the air is a needle in the haystack compared to what is heating our solar system.