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Human Dimensions of Global Change
Human dimensions of global change

The world human population first reached 1 billion people in about the year 1804. By 1900, the global population was estimated to be 1.6 billion. Forty years later, the world's population reached 3 billion, and the increasing growth has resulted in a population that was more than 6.8 billion in 2010. The period of time in which this growth occurred was very short in terms of Earth history, approximately 200 years, and enormous in terms of an increase in population that was approximately fivefold. The addition of more than 5 billion people in a 200-year period has resulted in huge changes on Earth. Scientists from the geographic, Earth, and environmental sciences have been observing and collecting ...

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