What is the world's biggest problem?

What is the biggest danger right now? Which problem poses the largest and most immediate threat to humanity? Of all the concerns we talk about, which one is going to impact our lives the most?
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As New York Times No. 1 best-selling authors, the Eyres have now written 50 books and speak throughout the world on families and life-balance. For additional information see www.valuesparenting.com or www.TheEyres.com.