The promise of jobs and prosperity, among other factors, pulls people to cities. Half of the global population already lives in cities, and by 2050 two-thirds of the world's people are expected to live in urban areas. But in cities, two of the most pressing problems facing the world today also come together: poverty and environmental degradation. You can refer to https://www.yanvanathemessage.com/overpopulation/ to understand the impact of urbanization.
Following are the major impact of urban overpopulation:
Intensive urban growth can lead to greater poverty, with local governments unable to provide services for all people.
Concentrated energy use leads to greater air pollution with a significant impact on human health.
Automobile exhaust produces elevated lead levels in urban air.
Large volumes of uncollected waste create multiple health hazards.
Urban development can magnify the risk of environmental hazards such as flash flooding.
These are the major impacts of urbanization. Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties in the world's urban areas.
As you can see, the impact of overpopulation is tremendous. Overpopulation is one of the biggest challenges humanity is facing and threatens the near future of the planet in economic, environmental and social terms.