Human Overpopulation: Have We Become An Invasive Species?

Reno Berkeley - Author
By

Aug. 30 2016, Updated 8:03 a.m. ET

Have human beings become an invasive species? With a sixth mass extinction underway, the planet’s future hangs in a precarious balance that may already be tipped irreparably.

Since our reliance on fossil fuels began, the human population has accelerated. Because of this, and because of the severe environmental changes occurring at rapid speed, it has become clear that human overpopulation is putting an enormous burden on Earth’s ecosystem.

Forests, which absorb carbon dioxide and give us life-sustaining oxygen, are being cut down at an alarming rate for lumber and farmland. Ecosystems that have developed over thousands of years are being scraped away for real estate development and agribusiness interests.

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During man’s time on this planet, our species has been responsible for much of the environmental catastrophes that have occurred.

The Rise And Fall of Easter Island

Take Easter Island, for example. Before 2000 BC, the small, 63-square-mile island had no human inhabitants. According to Easter Island Travel, Southeast Asians began expanding into the Pacific Ocean, finally reaching Easter Island by 1000 AD. Later, another migration occurred, this time from South America. Historians and anthropologists believe this second wave of pre-Incan settlers brought with them sweet potatoes, one of the later staples of the Easter Islanders’ diets.

Easter Islanders enjoyed a rich and diverse diet of native plants and animals, and a complex society that expanded to about 9,000 by 1550. However, because of overpopulation and stress on the island’s natural environment, the number of inhabitants had dwindled to fewer than 3,000 by the time the first known Europeans made contact in 1722.

Within 700 years, the lush, green island had become barren, stripped of trees, either by slash-and-burn farming or by Polynesian rats, which feasted upon tree roots and seeds. More than 16 million trees were decimated (in part for transporting the colossal stone carvings) native bird species no longer called the island home, and according to a report by the PBS program Nova, the inhabitants had even resorted to cannibalism to survive.

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The island experienced a profound and devastating ecological collapse due to human intervention and uncontrolled population growth. In other words, human beings became an invasive species.

Can We Survive Mass Extinctions?

A June 2015 National Geographic interview with environmental journalist Elizabeth Kolbert discusses the elevated levels of extinctions, and how human beings are a direct cause.

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There are very few, if any, extinctions that we know about in the last 100 years that would have taken place without human activity.

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Kolbert goes on to note that animal extinctions most often occur due to human hunting, humans bringing in invasive animal and plant species, cutting down forests, wide-spread use of mono-agriculture and, overfishing the oceans. This does not even take into account the pervasive and stubborn use of fossil fuels throughout the globe. As far has whether human beings can survive another mass extinction, Kolbert is not so sure.

If you give vertebrate species (and we are another vertebrate species) an average lifetime of a million years, and you say humans are 200,000 years into their million years, and you precipitate a mass extinction—even laying aside the question of whether humans will be the victim of their own mass extinction—you can’t expect that same species to be around by the time the planet has recovered.

It seems, then, that the idea of human beings as an invasive species makes sense. Wherever we go, human beings bring death, disease, and destruction, all in the name of progress.

In Kenya, the Northern White Rhino is as good as extinct, with only three remaining animals left alive in the world. Of those, just one is a male, and experts believe he may never mate. In-vitro fertilization has never worked on rhino species, so saving these animals from human-perpetuated extinction is a near impossibility.

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