President Obama says climate change is a national security threat. Too bad he doesn't act like it.

President Obama, in his Dr. Jekyll mode when it comes to climate change, has been advancing one of my favorite arguments on the issue: that it is a threat to national security. This isn't so much strictly true — our armed forces or cities are not under enemy fire — as a good way of shaking people out of the common idea that climate change is some marginal environmentalist issue. On the contrary, it's up there with the economy in importance.

As Greg Sargent reports, Obama brought up the idea in a speech yesterday before a graduating class of Coast Guard cadets, saying that the "urgent need to combat and adapt to climate change" would shape their whole careers. He's definitely right about that!

But the problem with his framing is that it does not remotely square with his actions. Only a few days ago Mr. Hyde emerged, with the Obama administration announcing preliminary approval for Shell to drill for oil in the Arctic Ocean off of Alaska. If we treated climate change as an actual security threat, that is not the kind of policy we would approve.

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McKenzie Funk, who wrote a long, riveting piece detailing how Shell wrecked an exploratory drilling rig in the Arctic in 2012, has an interesting follow-up article explaining how Shell's team of futurists think about climate change and oil:

This is almost certainly how Obama views the issue. Climate change is real, but energy demand is inescapable, and renewables just can't scale up fast enough to meet the demand. Therefore, if any previously frozen place in the Arctic melts, we better extract what carbon we can out of there.

It sounds tough-minded and realistic. It isn't. The only immovable part of the above equation is climate change, insofar as it is driven by the laws of physics and the quantities of greenhouse gases that have already been emitted. Everything else — from the rate of renewable installation, to the level of energy demand, to the future emissions path — can be changed with policy.

What's more, if you assume that no serious climate policy will be implemented, that the only way to decarbonize energy is to sit back and hope the price of solar panels continues to plummet, and that energy demand is utterly inflexible, then you are building catastrophic damage into your premises. Uncontrolled climate change, especially post-2100, could completely wreck much of human society.

Those assumptions are precisely the kind that are tossed over the side when war is declared. In full wartime mobilization, it would be rank defeatism to say something like, "Even if we scale up tank production by 25 percent a year, it'll take us decades to catch up with the enemy." Instead, the only question that matters is: "How do we wring the absolute maximum amount of materiel out of our stock of resources, capital, and labor?"

My favorite example of what this means practically can be found in Marc Reisner's classic book on the history of water in the American West. It concerns Grand Coulee Dam, which was just being completed when World War II broke out:

Enormous quantities of electric power — to this day Grand Coulee is the single largest power plant in the nation — enabled enormous smelting of bauxite into aluminum. That, in turn, allowed America to beat the world at airplane production.

If we really considered climate change a national security emergency (which it is), that's how we would be thinking. We would drop the faux-realistic, Very Serious Person estimates of how things are likely to proceed if we rule out all changes but piddling ones, and get down to what is and is not physically possible.

It turns out that there are worked-out models of a crash decarbonization comparable in vigor to a war effort. There's no way to know for sure if they'll work — but the only way to find out is to try.