From the article: "A recent study compared models as old as 1970 with observations made in the decades since. Some models warmed up too much, and some too little, but 14 of 17 past projections turned out to be consistent with the measured path of global average temperatures."

So we actually did an experimental test of the predictions made in 1970, and those predictions turned out to be largely correct.

We should probably halt this experiment on ethical grounds.