I for one believe that we are not the CAUSE of global warming; however, I do believe that we are now the main CONTRIBUTORS to global warming. Take a look at China. China has like 1/3 of the world's population and is massive export industry is causing a ton of pollution right now. Take a look at Google's main servers. Its servers alone require an entire cooling facility that requires a lot of electricity being produced by power plants. These factors, and many others that I have learned about over the years, are more than enough to have me a little worried.
But you're right. For me, I shouldn't be too worried about it; however, I do believe that if these problems are not addressed, my children and every other generation that comes after them might suffer as global warming reaches its peak.
I understand, that global warming is a never-ending cycle. But we have to realize that we are accelerating it. At what rate, we can't be certain at all. Like I said. There are factors that have me a bit worried.