Climate change: The new national security challenge

On August 6, 2001, President George W. Bush famously received an intelligence briefing titled, "Bin Laden Determined to Strike in U.S." Thirty-six days later, al Qaeda terrorists tragically turned threat into reality.

Today, scientists tell us we have a 10-year window — if even that — before catastrophic climate change becomes inevitable and irreversible.

This is our intelligence briefing — it tells us the threat is real and time is not on our side.

The national security threat posed by...