It was much hotter in the past than it is now. Look at any attempt to reconstruct temperatures from proxies. The underlying science is unreliable but everyone a

It was much hotter in the past than it is now. Look at any attempt to reconstruct temperatures from proxies. The underlying science is unreliable but everyone agrees the distant past had average temperatures far hotter than today. It was actually warmer even in the recent past. There's archaeological evidence that it was warmer in the Roman and middle ages than it is now. This was once uncontroversial and if you read archaeology papers you can still sometimes see discussion of this fact. But they don't highlight this because they don't want to pick fights with climatologists. There's hasn't been any cliff edge rise in temperature. Look at graphs of global temperature but be aware they're heavily manipulated. A graph of 20th C temperatures published in 1999 looks very different to the same graph published today.