Who is this guy? He is contradicting economic analysis that’s been incorporated into IPCC reports. He uses the phrase “so called Nobel Prize.” He isn’t even currently a professor at any institution. He’s apparently supporting his research with “crowd sourced funding.” https://en.wikipedia.org/wiki/Steve_Keen

Apart from that, the gist of his critique seems to be that economists are using linear extrapolations and aren’t incorporating “tipping points” into their analysis. But its the climate scientists at the IPCC itself who have consistently declined to give tipping points and runaway effects significant weight. That’s true even in the latest 2022 IPCC report: https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6.... The strongest thing the executive summary says about “tipping points” is that certain ones “cannot be ruled out.”