There were a lot of different models, including some that were really close to the timelines we see now. All of those depended on different amounts of emissions, and if humanity took this seriously as soon as it was discovered the rate of change would be wildly different.

But there were very little significant changes to curb the emission rate, so we’re currently following the path of some of the worst predictive models. They still existed, just weren’t publicized as much as those that counted on some more reasonable approaches.