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The cold not only bears down on human bodies, but also bends sound. The forest sits under an inversion, chilled air pooling under a warmer cap. The colder air is like molasses for sound waves, slowing them as they pass, causing them to lag sound travelling in higher, warmer air. The difference in speed turns the temperature gradient into a sound lens. Waves curve down. Sound energy , instead of dissipating in a three dimensional dome, is forced to spread in two dimensions, spilling across the ground, focusing its vigor on the surface. What would have been muffled, distant sounds leap closer, magnified by the jeweler’s icy loupe. The aggressive whine of the snowmobile mingles with the churr and chip of red squirrels and chickadees. Here are modern and ancient sunlight, manifest in the boreal soundscape. Squirrels nipping the buds of fir trees, chickadee poking for hidden seeds and insects, all powered by last summer’s photosynthesis; diesel and gasoline, sunlight squeezed and fermented for tens or hundreds of millions of years, now finally freed in an exultant engine roar. Nuclear fusion pounds its energy into my eardrums, courtesy of life’s irrepressible urge to turn sunlight into song.
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David George Haskell (The Songs of Trees: Stories from Nature's Great Connectors)