Malthus was more or less right in 1798, and Ehrlich was also correct. Their timelines were a little off. In the case of Malthus, he could not have possibly anticipated that humans would be able to find and exploit hundreds of billions of tons of fossil fuels from deep underground, nor that humans would use this for concrete production, steel production, fertilizer manufacturing, pesticides, drugs, clothing, plastics, etc. As a result, humans have enjoyed a 150 year party which allowed enormous population growth, and unimagined rates of consumption and construction. And the party is not quite over yet. Even Ehrlich's, "The Population Bomb" underestimated the additional population and consumption which could be supported using ever more fossil fuels. But his fundamental ideas were spot on, and were simply delayed for a moment. The Club of Rome used the MIT World 3 model, as did "The Limits to Growth" in 1972. These predictions were much more realistic, and have been updated repeatedly with the World3-03 in 2005 and now a recalibration in 2023 which shows the likely scenario that human population will reduce to about 2.6 billion people by 2100, and declining further during the next century to between zero and 2 billon.