I disagree with their approach and conclusion ("Deforestation will continue accelerating at the same rate forever! Technology will continue accelerating at the same rate forever! Population growth will continue at the same rate forever!"), which strikes me as being misguided in a classically Malthusian way. But the paper is worth taking a look at, as there is an interesting discussion of the Fermi paradox, where we lie on the Kardashev scale, and the possibility that societal collapse due to overconsumption of resources is the Great Filter[0].