Few loyal readers — and there are many — are likely to consider prominent Washington Post economics columnist Robert J. Samuelson a “green” determined to get to the bottom of the climate change conundrum. His columns — he’s been at it with the Post since 1977 — have left little doubt that his heart and his financial calculator lie elsewhere.

Which makes his November 18, 2013, column in The Washington Post all the more notable.

It’s not likely, mind you, to win Samuelson any “green awards” from climate activists, but his words that “For years I’ve advocated an energy tax — my preference now is a carbon tax” nonetheless are striking, even in the full context of much else he writes in that column that is more vintage Samuelson.

He points to what he calls “gaping uncertainties,” “assumptions,” and “more assumptions” in lauding work by MIT economist Robert Pindyck in his review of climate models of effects and costs of climate change. To Samuelson, Pindyck is “a global warming pragmatist and not a “denier.” He points to Pindyck’s view that climate change and adverse economic impacts “could be wildly overstated…could be wildly understated…might ultimately be catastrophic.”

“We simply don’t know. Ignorance reigns,” he writes in praising Pindyck’s — and now his own — support for a “modest carbon tax.”

“There are certainly some ill effects of global warming,” Samuelson writes, saying more knowledge over time could lead to further adjustments in the tax rate.

Announcing what he now calls his own “standard,” Samuelson wrote, “Support policies that, though they might address climate change, can be justified on other grounds. It’s a partial solution, because there is no complete solution.”

Noting what he calls the “paralysis” surrounding potential climate policies, Samuelson pointed to the challenges of reaching “collective agreement” among diverse countries around the world; the political challenge of governments’ making today’s citizens feel pain for “hypothetical gains (less global warming) for tomorrow’s citizens; and what he sees as environmentalists’ overstatements and “dire terms”: “If failure is fated, why bother?”

His approach: put a price on carbon through a tax on oil, coal, and natural gas based on the costs of global warming. How much is that? “We don’t know global warming’s full effects.” But a carbon tax might help in funding movement toward a simpler income tax, and in addressing multiple problems “an admittedly unpopular carbon tax might command broader support.”

“Who knows?” Samuelson concluded. “It might even pass.”

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