AREQUIPA, Peru (AP) — Rising sea levels and other effects of climate change will pose major challenges for America’s military, including more and worse natural disasters and the threat that food and water shortages could fuel disputes and instability around the world, Defense Secretary Chuck Hagel said Monday.

Addressing a conference of military leaders as the Pentagon released a new report on the issue, Hagel said, “Our militaries’ readiness could be tested, and our capabilities could be stressed.”