
Experts at the University of Arizona Health Sciences say the troubling trend has several contributing factors, including the explosion of the world population from around 1 billion people in the early 1800s to around 8 billion today.
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Experts at the University of Arizona Health Sciences say the troubling trend has several contributing factors, including the explosion of the world population from around 1 billion people in the early 1800s to around 8 billion today.