Ehrlich’s doom-n-gloom was the “Population Bomb” with overpopulation causing worldwide famine in the 70s & 80s.
https://www.spiked-online.com/2015/09/29/the-simon-ehrlich-wager-25-years-on/
In 1980, economist Julian L Simon challenged Paul R Ehrlich, the biologist and author of the best-selling Population Bomb, to put his money where his catastrophist mouth was by staking $10,000 on his belief that ‘the cost of non-government-controlled raw materials… will not rise in the long run’, with the minimum period of time over which the bet could take place being one year (1).
If, as Ehrlich believed, the store of valuable resources was absolutely finite and subject to ever-increasing demand, the resources’ price would rise.
Simon, however, argued that in a market economy characterised by freely determined prices and secured property rights, a rise in the price of a valuable resource could only be temporary as it would provide incentives for people to look for more of it, to produce and use it more efficiently, and to develop substitutes. In the long run, even non-renewable resources would become ever-less scarce as they are ultimately created by the always renewable and ever-expanding human intellect.