Oceanus Magazine
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How Carbon Cycles Through the Earth

Carbon moves naturally through the ground, ocean, and sky in a cycle over millions of years (large white arrows). People have short-circuited the cycle, transferring carbon quickly from ground to air by burning fossil fuel. Iron fertilization proposes to accelerate the transfer of carbon from air back to the ocean. (Illustration by Jack Cook, Flash by Katherine Joyce, Woods Hole Oceanographic Institution)