Overpopulation is still a concern when considering biodiversity, groundwater loss, etc.

The latest UNEP report includes it - see page 37 from https://www.unep.org/resources/global-environment-outlook-7 -> https://wedocs.unep.org/rest/api/core/bitstreams/902187bf-ea...

"Among the major global environmental crises – climate change, biodiversity loss and land degradation, and pollution and waste – population growth is most evidently a key factor in biodiversity decline. This is largely due to increased demand for food production, which leads to agricultural expansion and land degradation (Cafaro, Hansson and Götmark 2022). As the population grows and consumption rises, fewer resources and less habitat are available for non-human species (Crist 2019). Overpopulation occurs when the total human population multiplied by per capita consumption surpasses the capacity of sustainable ecosystems and resources. Although the global human population continues to grow, per capita consumption is increasing at a faster rate. To the extent that people are disrupting natural habitats and degrading ecosystem services for future generations, despite regional heterogeneity, some research suggests that most of the world’s nations may be considered overpopulated (Lianos and Pseiridis 2016; Tucker 2019)"

Specifically going back to 70s overpopulation concerns, thing shifted with the Green Revolution / Norman Borlaug but it came at the cost of reducing groundwater supply and reducing agricultural diversity. See 'The Globalization of Wheat' and https://climatewaterproject.substack.com/p/groundwater-and-c...