Hill: Having spent more than 30 years in the US Marine Corps, I know what constitutes a national security threat. Climate change, caused in large part by the carbon pollution we dump into our air, presents risks to the safety of both our nation and our world at large. The threats of climate change include extreme weather, rising sea levels, reduced military capacity, and conditions that can enable worldwide violence and perpetuate terrorism.
To address this challenge, well need to both prepare for...