We really didn't have the technology back then to substitute green energy for fossil fuels. Now we do and prices have come down a lot and will continue to do so. Fifteen years from now climate change will be like the ozone hole today.

Just one example, ten years ago solar panels were only financially viable (and needed subsidies at that) in the hottest places and low latitudes. Now Norway is putting up solar panels north of 60 degrees. The panels are more efficient but the primary factor is that the price has come way down.