Overpopulation of any single species is dangerous both for the species itself and for the entire ecosystem of which it is a part, and humans are no exception. The main danger of overpopulation to humans is the scarcity of resources available to provide adequate food, water, shelter and care. Overpopulation leads to famine, disease, and ultimately violence, as people must fight for their survival. Huge disparities currently exist within the global population between those that have more than enough to eat and those who are literally starving to death.
In the struggle to sustain our incredibly burdensome numbers, we inevitably do serious damage to the world at large. Animal extinctions are frequently the result of our crowding out other species (both animals and plant), hogging resources for ourselves as well as for our agricultural endeavors, and hunting.
Moreover, the finite materials that our lifestyles are built on, such metals, clay, oil and wood, will not be available to us forever (especially given the rate at which we consume them). These too will eventually be depleted.
Already, the needs of the world’s human population far exceeds what we are able to provide for ourselves and what the world is able to provide for us. Ultimately this could lead to the collapse of the entire world’s animal and vegetable populations, humans included.
As Maddie said above, as the human population grows, we are crowding out, poisoning and/or eating all other species (both animals and plants alike) into extinction. Because of our over consumption, the natural materials off of which we live will sooner or later run out, as, again, Maddie mentioned above.
By the end of this century, the population is expected to hit 10 billion. This massive population growth will negatively effect all biodiversity around the globe–the biodiversity that all species need to maintain the intricate web of life we’ve depended on since the dawn of time. By 2050, it is predicted that up to 70% of the world’s population will live in urban areas–and it is historically known that urban growth and poverty go hand-in-hand, with nearly 1/3 of the world’s urban dwellers already living in slums in 2000. Public health, naturally, will decline. Joblessness will increase; even now, in order to reach the 8% unemployment rate goal for 2012, Congress needs to be able to create 208,000 jobs a month, and that’s in the US alone!
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