Overview
- Peer-reviewed research in Environmental Research Letters concludes the planet can no longer support the human population sustainably.
- The authors project a population peak of about 11.7 to 12.4 billion in the late 2060s to 2070s if current trends persist.
- They estimate a sustainable population near 2.5 billion if everyone lives comfortably within ecological limits.
- The analysis of more than two centuries of records identifies an early‑1960s shift to a “negative demographic phase,” when adding people no longer sped population growth.
- The study links total population more than per-person use to rising temperatures, larger ecological footprints, and higher carbon emissions, and it urges rapid shifts in energy, land, and food use without predicting a sudden collapse.