To cull the dead trees, Lin Spicer had to drive his tree cutter onto a treacherous stretch. Some of the pines he could almost have pushed over with his hands, there was that little holding them to the marshy flat of the Blackwater National Wildlife Refuge, on Maryland’s Eastern Shore. Needles long fallen, bark sloughed off, these stands of trees resemble fleets of ship masts slanted along the water’s edge. Spicer was riding among them on his tractor-sized machine, when he found that he was sinking down, down, down, and…
