Global Population Exceeds Stability Limits: New Research by Scientists

The Earth's population, which today stands at approximately 8.3 billion people, has already exceeded the limits that the planet can stably support, given the current rates of resource consumption. This alarming conclusion comes from a new study conducted by a team of scientists led by Corey Bradshaw from Flinders University, who analyzed over 200 years of demographic data.

The researchers concluded that humanity is living far beyond what the Earth can endure in the long term. Ecologists define this as 'carrying capacity' — an estimate of how many individuals of a particular species can exist in conditions of limited resources and their rate of replenishment. According to the scientists, humans have temporarily expanded these limits through technological progress, particularly due to the use of fossil fuels.

The transition to fossil fuels in the 20th century was a key factor that allowed for a dramatic increase in the planet's population. However, despite these advancements, scientists emphasize that the Earth is not able to replenish resources as quickly as humans consume them. Bradshaw stated that the planet can no longer sustain even the current level of consumption without significant changes in approaches to resource utilization.

In the study, the scientists also distinguish between two concepts: maximum capacity, which is a theoretical limit even if it is accompanied by famine and wars, and optimal capacity, at which humans can live sustainably and with an acceptable quality of life. Their estimates suggest that the maximum limit is around 12 billion people, while the optimal limit is only 2.5 billion. This indicates that the current problems of overconsumption observed globally are a result of exceeding the optimal threshold.

The research showed that until the 1950s, the population was growing at an increasingly rapid pace; however, since the 1960s, the growth rate has begun to slow down, even though the total number of people continues to rise. Scientists have termed this change as a 'negative demographic phase,' where the birth of new individuals no longer accelerates overall population growth. Projections indicate that if this trend continues, the population will peak at between 11.7 and 12.4 billion people in the 2060s to 2070s.

The difference between the optimal 2.5 billion and the current 8.3 billion, according to the researchers, explains the modern issues of overconsumption. Specifically, the United Nations has already reported a global water crisis, and animal populations are declining due to competition with humans for resources. While the use of fossil fuels temporarily increases the planet's capacity for producing fertilizers and energy, it simultaneously causes climate change, which devastates ecosystems.

The researchers also believe that population growth has a greater impact on temperature, emissions, and ecological footprints than the increase in consumption per person. They warn that without rapid changes in the use of energy, land, and food, billions of people may face instability in the future. However, the authors of the study note that the situation can still be altered if countries work together to find solutions for sustainable development.