Halving the world’s population over the next two centuries could dramatically reduce pressure on the planet, according to researchers who argue that a slower, voluntary decline could help restore ecosystems and curb climate damage.

The proposal may sound like something from Avengers: Infinity War, where Thanos wipes out half of all life in an instant. But scientists behind the study stress that their vision is the exact opposite: a gradual and just reduction in population, alongside lower consumption.

Humanity’s explosive growth is putting the planet under pressure

The global population has surged from around two billion in the 1920s to about 8.3 billion today, driven by longer lives, falling child mortality, improved living standards and wider access to education and rights.

Researchers writing in Sustainable Development argue that biodiversity loss, resource consumption and pollution are closely linked to population size. They warn that humanity’s combined impact on natural systems has become unsustainable.

The target: four billion people by 2200

The scientists suggest gradually reducing the global population to around four billion or fewer by 2200. They argue this could ease demand for resources while allowing damaged habitats and wildlife populations to recover.

The benefits could extend beyond the environment, with lower greenhouse gas emissions, reduced pollution and less competition over resources. Researchers also point to potential economic gains as populations decline.

Kerala offers a glimpse of the strategy

The study cites India’s Kerala state as an example of how population growth can be slowed without coercion. Higher education, greater female empowerment, later marriage and widespread voluntary family planning helped reduce population growth while living standards improved.

Researchers argue that the lesson is not about forcing people to have fewer children, but about expanding choices and opportunities. High-income populations also consume vastly more energy per person than those in poorer countries, meaning population numbers are only one part of the environmental equation.

A slower, smaller world could ease the strain

The researchers say a population of around four billion by 2200 could protect natural habitats, reduce emissions and pollution, ease resource conflicts and help conserve wildlife.

Their central argument is blunt: rather than waiting for environmental crises to force change, humanity could gradually and voluntarily reduce its footprint — giving the planet a chance to recover without anything remotely resembling Thanos’s fictional snap.

Study reveals halving human population gradually could help Earth

Global population growth has significantly slowed down, except in Africa.

Halving is a good idea ... start wth the scientist.