Recognising that global warming will make any line based on the watershed of a glacier temporary, the understanding with Austria has for the first time introduced the concept of a movable border.
Tentatively, I am drawing a line in the sand at the crucial watershed of Dow 3, 000, because any hysterical selling beyond that point would be anti-American and counterproductive.
But he said what has happened at Kaesong wasn't a watershed moment like the shelling of a front-line South Korean island or the sinking of a South Korean warship, two attacks that killed 50 South Koreans in 2010.