Which one ? King Hubbert's prediction was true. Campbell and Laherrère's prediction was also true. (You can say that they failed to predict the tight oil and

Which one ? King Hubbert's prediction was true. Campbell and Laherrère's prediction was also true. (You can say that they failed to predict the tight oil and bituminous sands boom, focusing instead on the (thankfully still completely uneconomical) oil shale potential, but the gist of them being extremely dirty and expensive also fits.)