@USArmy has been posting 1min delta responses to what seems to be random comments going against the "climate change is a threat" message. Them responding in such a manner and Clinton tweeting today and seems to suggest there's another meaning

Climate change is a serious threat to U.S. national security interests and defense objectives.

The effects of climate change can cause humanitarian disasters, undermine weak governments and contribute to long-term social and economic disruptions.

Warming temperatures open new theaters of operations for military and commercial use, while extreme weather events and rising sea levels threaten infrastructure and economic output, trigger large-scale population displacement, and exacerbate food and water insecurity.