A NASA study published last January in the Journal of Climate shows that the oldest and thickest Arctic sea ice is disappearing at a faster rate than the younger, thinner ice at the edges of the Arctic Ocean's floating ice cap. Images show the ice cap in 1980 and in 2012. NASA

(AP) YOKOSUKA, Japan – To the world’s military leaders, the debate over climate change is long over. They are preparing for a new kind of Cold War in the Arctic, anticipating that rising temperatures there will open up a treasure trove of resources, long-dreamed-of sea lanes and a slew of potential conflicts. By Arctic standards, the region is already buzzing with military activity, and experts believe that will increase significantly in the years ahead. Last month, Norway wrapped up one of the largest Arctic maneuvers ever — Exercise Cold Response — with 16,300 troops from 14 countries training on the ice for everything from high intensity warfare to terror threats. Attesting to the harsh conditions, five Norwegian troops were killed when their C-130 Hercules aircraft crashed near the summit of Kebnekaise, Sweden’s highest mountain. The U.S., Canada and Denmark held major exercises two months ago, and in an unprecedented move, the military chiefs of the seven main Arctic powers — Canada, the U.S., Russia, Iceland, Denmark, Sweden, and Finland — are to gather at a Canadian military base in May to specifically discuss regional security issues. None of this means a shooting war is likely at the North Pole any time soon. But as the number of workers and ships increases in the High North to exploit oil and gas reserves, so will the need for policing, border patrols and — if push comes to shove — military muscle to enforce rival claims. The U.S. Geological Survey estimates that 13 percent of the world’s undiscovered oil and 30 percent of its untapped natural gas is in the Arctic. Shipping lanes could be regularly open across the Arctic by 2030 as rising temperatures continue to melt the sea ice, according to a National Research Council analysis commissioned by the U.S. Navy last year. What countries should do about climate change remains a heated political debate. But that has not stopped north-looking militaries from moving ahead with strategies that assume current trends will continue. […]

As Arctic ice cap melts, a new Cold War