Population growth is limited by the supply of resources. At some point there will no longer be enough resources, such as land, fresh water, top soil to grow food in, fuel to transport the food, building materials etc to support the growing population.
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The Earth's resources are finite, and continual exponential growth in population would eventually exceed the planet's ability to sustain everyone. This could lead to increased competition for resources, environmental degradation, and pressure on infrastructure and social systems. A stable population size is important for ensuring a sustainable future for both humans and the planet.
To ensure the human population continues to grow sustainably, we need to manage resources, control birth rates, and address environmental impacts.
As of 2021, the global human population is estimated to be around 7.9 billion. This number is constantly changing due to births, deaths, and migration patterns. The population is projected to continue growing in the coming decades.
Hair and nails are the two things on a human that never stop growing, although they do eventually reach a point where they stop growing longer.
Thomas Malthus, a British economist, suggested in his 1798 work "An Essay on the Principle of Population" that population growth is limited by resources and that famine, disease, and war are natural checks to prevent population from endlessly growing beyond available resources.
The human population has used natural resources. Some say the population has depleted, or nearly depleted, some natural resources, but others deny that.