There were no humans or large volcanoes. Which is huge, but go on... You have the internet, don't you? Humans are emitting CO2 in large quantities. CO2 is a greenhouse gas. These levels of CO2 haven't been seen in all of human history. The rate of warming is faster than in all of human history. No, the natural cycle was infinitely preferable to this. Is this your bargaining phase? First you have to accept that there is a problem. It's effecting all life on Earth, so it matters. The significant part. Human activity is completely responsible for increased CO2 levels. There are other sources, but they average out over time. God doesn't exist. People did change the course of the climate, that's as much of a fact as science can say. I don't think industrial society has a future, so your adaptation proposals are irrelevant.