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globalchange

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holocene(2)
abrupt change(1)
alaska(1)
beringia(1)
climate change(1)
climatic change(1)
fossil pollen(1)
hemlock (tsuga canadensis) decline(1)
lake levels(1)
multi-proxy(1)
northeastern u.s.(1)
paleoclimate(1)
synthesis(1)
yukon(1)