7 Billion And Counting: Can Earth Handle It?

National Public Radio: Earth's population stands at nearly 7 billion, and demographers project we may reach 9 billion by the middle of this century. In the past 50 years, population has grown at a rate never before seen in human history. Pastures have become towns, cities have sprawled across the landscape, and humans now live in places once considered remote. The change is so dramatic that some scientists now refer to this as "the age of man." But as humanity's reach expands, forests are vanishing, glaciers are......

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