I can spare a few moments to answer that one...
First, Of course I believe the climate is changing. It has always changed, and always will. The question here is, Attribution. Is the current warming a product of human's CO2 output, or is this just another cycle of warming?
While I do believe that there is Some effect caused by humans, I think it is more an issue of land use (and air pollution), rather than CO2. And the argument(s) for that, are going to take a lot longer than I have time for just now However you can see some of it in the other articles I have put up.
Environmental issues... well I do have concerns about the environment. And I've been involved- I worked seven years for the Otter Habitat in Pennsylvania (had the chance to help hand-raise several otters, in fact). Again, I'm answering quickly, sorry about that...
Last one for the moment: I started out in the early 80s, believing that Yes, we were messing up the climate. But due to the droughts we experienced in the 80s, I was paying close attention to the weather, and learning about how it works.
In the late 80s - 89, I think - I saw several newspapers articles. One was about the just-discovered mechanism in the Pacific known as El-nino (and La-nina). It has been known about for centuries, but not How it worked.
The other article was about a week later. It had to do with hurricanes. Scientists were puzzled by the way they were behaving (I believe it was similar to what is happening this year).
While I did not yet know much about either, I saw a connection between those two pieces of the climate puzzle. It made sense to me that El-nino is going to affect things across the globe. Yet, here are scientists being puzzled by it. And at the same time, people were already saying 'the science is settled' about the climate.
I've been learning more ever since.
That be it for the moment.