It’s the ground underfoot that land trusts know best. The sentient ways of old forests and brooding mountains; the salt tang of tidal marshes and sagebrush reaches of open rangeland. Compared to these tangible places, the idea that we should protect something as intangible as darkness can seem abstract. What is darkness, after all, but the absence of light? And, in a light-saturated world where 80% of North Americans can no longer see the Milky Way, does darkness still serve its age-old purpose? Those are questions that land trusts, no less than scientists or philosophers, may well consider.

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