The greatest threat to humanity in the next 100 years is climate change; that is, nuclear warfare resulting is a “nuclear winter” destroying most of the foundations of life on earth.

Fox News -- Chris Ciaccia
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“Sharon Squassoni, Georgetown University professor and member of the Science and Security Board of the Bulletin of Atomic Scientists, noted how extreme the nuclear weapons situation has become. She cited the recent collapse of the Iran nuclear deal, the reemergence of North Korea's nuclear capabilities and the continued buildout of weapons from the U.S., Russia and China.”