A fallen tree near Mammoth Mountain. Natural CO2 emissions from a magma body beneath Mammoth Mountain asphyxiated more than 100 acres of trees near Horseshoe Lake in the early 1990s.

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A fallen tree near Mammoth Mountain. Natural CO2 emissions from a magma body beneath Mammoth Mountain asphyxiated more than 100 acres of trees near Horseshoe Lake in the early 1990s.

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