Pakistan, Aug. 12 -- Climate change is increasingly being viewed as a major UK-US national security threat, with lawmakers warning that extreme weather, food insecurity and energy instability could create serious risks for both countries. From devastating wildfires in Southern England and Oregon to growing pressure on food systems, the effects of a warming planet are reshaping how governments understand national security.

Britain's National Security Strategy has warned that climate change could have a significant impact on the lives of its citizens. British intelligence assessments have also raised concerns over food security and the possibility that ecological disruption could increase the risk of conflict and military escalation. Simil...