As the human population continues to grow, questions arise concerning how to deal with problems that are human in origin: problems like pollution and environmental degradation, resource depletion, and global food shortages. The global population, which currently sits at over 7 billion, is expected to reach 10.9 billion by the end of the century.
As populations increase, the rate of greenhouse gas emissions also increases. Topsoil depletion that took place between the years 1900 and 2000 was equal to the depletion that took place in the 1000 years that preceded it. As a result, land that is suitable for agriculture becomes more and more scarce and our ability to produce enough food for climbing populations is threatened.
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