For the first time, NATO is updating its strategic plans to treat climate change as a major threat. In documents published yesterday as allied leaders gathered in Madrid, NATO declared that the 30-member alliance — which soon will include Finland and Sweden — aspires to become the “leading international organisation” on climate security, including the need to curb greenhouse gases. Rising temperatures will threaten global stability, the alliance warned, and also degrade militaries’ capabilities to fight wars and respond to disasters. “Climate change is a defining challenge of our time, with a profound impact on Allied security,” NATO wrote in...