Climate Topic

In all of the categories the one that interested me most was the concerns, I would like to find out what the people's concerns were and why were they having these concerns. One of the most interesting questions in this section is the one about the cause, did humans cause the climate change, was it natural, or was it a combination? I don't know the answer to this right now but I would like to find out for myself, and also see what people of the time period found out.