What Does This Symbol Mean?

This weekend, I needed to buy some lumber to finish the roof over the oven I have been building. When I got to the lumber yard, I noticed that some of the wood was stamped with a symbol of a tree and check-mark.

Does this mean "sustainability"?

Does this mean “sustainability”?

Is this wood “sustainable”? Other times, I have seen a similar symbol — but with a different set of letters — on other wood and paper products. And so, in trying to make sustainable choices in my own projects, I end up facing very real questions about sustainability claims and the value of online sources of information — questions that will form the basis of how ninth grade students are taught to evaluate their own sources.

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