“In 1950, there were three times as many Europeans as sub-Saharan Africans. By 2100, there will be five sub-Saharan Africans for every European. That’s a 15-fold change in the ratio. Could you imagine that that might have an impact, geopolitically and on international migration?” Joel Cohen
In terms of evolution, the species Homo sapiens is extremely successful. The populations of other species that are positioned similar to us on the food chain tend to max out at about 20 million. We, by contrast, took just 120,000 years to achieve our first billion members, and then needed only another 206 years to add 6 billion more. According to the United Nations Population Division, our population will hit 7 billion on Oct. 31, and though fertility rates have begun to decline across much of the globe, we’re still projected to reach 9 billion by mid-century and level off at around 10 billion by 2100.
A panel of academics met at Columbia University’s Earth Institute on Monday (Oct. 17) to discuss the impacts of the human population explosion, including the ways in which it will change the face of the Earth this century. Here are five striking changes you — or your kids or grandkids — can expect to see.
Annual population percent change in the world based on data from the 2011 CIA World Factbook.
Shifting people
Currently, it’s a well-known fact that China is the most populous country in the world, and that Africa, though riddled with problems, is not necessarily overpopulated considering its size. These facts will drastically change. China’s one-child policy has significantly curbed its growth, while in some African countries, the average woman gives birth to more than 7 children. [How Many People Can Earth Support?]
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