As David makes the point (at the near end of the video), the best available science in the 1970's predicted that the climate was cooling down. The best available science of today (not the least, with the help of best marketing) would predict Global Warming.
The same best scientific estimates of the day also predict that our best projections to bring down the emissions (which we will not achieve) themselves suffice only to move the disaster point a little further, but not prevent the inevitable.