This is a site that explains a lot about the science related to the climate madness:

https://clintel.nl

Mind you: they are not denying that the climate is changing, but they put things in their proper perspective, as you did with your remark that the earth has gone through multiple cold/warm periods. 

 Clintel is doing great work, have been to a presentation of them. And no one can deny climate change, because it is ever changing 🙃.