Environmental forecasts rejected as wrong can prove right over longer timeframes

Evidence

In his defense, Ehrlich argued that his forecasts were scenarios of possible outcomes, not explicit predictions. However, critics easily refuted his forecasts, because the proposed time frame was too short for catastrophic effects to occur. In a wager that was billed as a battle between Malthusians and Cornucopians, Ehrlich bet his archcritic, the economist Julian Simon, that the price of five commodity metals would rise over a decade. Ehrlich lost the bet. Conservative critics proclaimed that the population bomb had been successfully defused. It was not that Ehrlich’s concern over the adverse effects of soaring population growth were groundless. Rather, he projected his forecasts over too short a time. This is true even for the famed metals wager. The investor Jeremy Grantham showed that the prices of the selected metals actually had risen in real terms when calculated over a more extended period (Rotella, 2011). Ehrlich lost the bet in the short term, but won it in the long term. — Albert Bandura, Moral Disengagement, 2556

Categorization

• ADDENDUM: Connects to the sacrifice/infrastructure pieces as an example of how public dismissal of long-horizon warnings follows a measurable pattern — the metals wager’s short-term loss but long-term vindication is a clean case study of temporal discounting in environmental judgment.
• QUESTION: Worth chasing: does the Ehrlich-Simon metals wager outcome hold under rigorous reanalysis, and what does the choice of time window reveal about how we arbitrate contested forecasts?
• corroborated: 2 independent passages support this claim — Albert Bandura, Moral Disengagement: How People Do Harm…, 2556