It baffles me that people are still denying climate change

More specifically these folks are trying to claim that it's completely natural and humans have no effect on the climate therefore we shouldn't worry about it, however that's a really dumb thing and you only need to know a couple or more things to realize that we do have an effect on our climate. Bill Nye did an experiment where he had two clear containers if I remember correctly, he put more carbon dioxide in one of them. The container with more carbon dioxide had higher temperature (If I'm remembering correctly). Unless these climate change deniers also want to deny that factories and cars emit carbon, then it shouldn't take a rocket scientist to figure out "Maybe we are impacting our climate". So, it baffles me that the climate change deniers tend to accuse those who know that climate change is an actual thing of not doing their own research even though they most likely aren't doing any research either. If those climate change deniers did "research", then they should be hearing out both sides, not one.