The Pentagon is in the midst of a massive, multi-year effort to better adapt to climate change and reduce greenhouse emissions. But the changing climate is already imposing costs on the military and even challenging how well it can prepare to fight other nation states. “In terms of current operations, we have National Guardsmen, we have active-duty soldiers, we have active-duty airmen right now participating in firefighting support efforts. So these are…folks who are not doing a primary job. So right now we are experiencing climate change and effects. Right now, we know that these are going to only increase over time,” Richard Kidd, the deputy assistant defense secretary for environment and energy resilience, said in an interview.