I believe humans are affecting the climate.
There are 6 billion humans, the idea that we aren't affecting the climate is pretty silly IMO.
That being said, the converse, that we are definitely causing warming and it is definitely harmful, I find to be not clear cut. I don't see rising oceans, I don't see more wild weather, I don't see any other of the thousands of negative affects that they claim is happening. I'm very skeptical of the claim that the science isn't hopelessly corrupted by politics.
I'm also not entirely sure there has been warming in my lifetime. I seem to recall a lot of snowless winters in the 80's (when I grew up).