Aug 242010
 
Human population growth rate in percent, with ...
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With population and per-capita consumption both on the rise, it’s hard to believe human’s impact on the Earth is sustainable.

But what would happen if we ate less meat? Or gave women better education and more power?

Two German Shepherds kept as pets in Europe or the U.S. use more resources in a year than the average person living in Bangladesh. The world’s richest 500 million people produce half of global carbon dioxide emissions, while the poorest 3 billion emit just 7 percent. Industrial tree cutting is now responsible for the majority of the 13 million hectares of forest lost to fire or the blade each year—surpassing the smaller-scale footprints of subsistence farmers who leave behind long, narrow swaths of cleared land, so-called fish bones.

In fact, urban population growth and agricultural exports drive deforestation more than overall population growth, according to new research from geographer Ruth DeFries of Columbia University and her colleagues. In other words, the increasing urbanization of the developing world—as well as an ongoing increase in consumption in the developed world for products that have an impact on forests, whether furniture, shoe leather or chicken fed on soy meal—is driving deforestation, rather than containing it as populations leave rural areas to concentrate in booming megalopolises.

So are the world’s environmental ills really a result of the burgeoning number of humans on the planet—growing by more than 150 people a minute and predicted by the United Nations to reach at least 9 billion people by 2050? Or are they more due to the fact that, while human population doubled in the past 50 years, we increased our use of resources fourfold?

Peak Humanity

First and foremost, human population growth peaked long ago, according to demographer Joel Cohen of Rockefeller University in New York and others. The peak growth rate—a little more than 2 percent per year—occurred somewhere between 1965 and 1970, when the world’s population was just 3.3 billion people, and has been dropping ever since, reaching a little over 1 percent today. In 1987, the number of people added to the planet each year topped out at 87 million, a number that is now down to roughly 78 million people per year. That means human population numbers will drop voluntarily for the first time ever in human history in the 21st century. A Baby Bust has replaced the Baby Boom.

The reason? Empowerment of women. A massive reduction in child mortality, combined with educated mothers pursuing their own advancement and in control of birth control, has helped to drop the average human brood from over five children per woman of childbearing age to just 2.6 per woman today. As journalist Fred Pearce writes in his new book, The Coming Population Crash: “The population bomb is being defused. By women. Because they want to.”

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