How convinced are you that human activities are a significant cause of changes to the Earth's climate and long-term weather patterns?

There is no doubt in my mind that some of the things we have done has had some effect on it...but I do not believe it is as drastic as is believed. I believe that the biggest part of it is natural...our planet has been through drastic changes since it's very beginning and some of it with "catastrophic" effects. I believe this is mostly just another one of those changes and we just happen to be among those to be seeing it. We are actually having less of an impact now than we were 30 plus years ago because of all of the regulations and laws that have changed or restricted those things. I know that there are going to be people to challenge me on this and I will ignore it because I am not wishing to argue and debate it...I am just answering a question.