If forests are the lungs of the planet, then animals migrating across oceans, streams, and mountains-eating, pooping, and dying along the way-are its heart and arteries, pumping nitrogen and phosphorus from deep-sea gorges up to mountain peaks, from the Arctic to the Caribbean. Without this conveyor belt of crucial, life-sustaining nutrients, the world would look very different. The dynamics that shape our physical world-atmospheric chemistry,...
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