Deep in the ocean lies the world’s largest active carbon reservoir, which plays a pivotal role in buffering our planet’s climate. Of the roughly 10 billion metric tons of carbon dioxide we emit each year, about 3 billion metric tons are taken up and stored in the oceans—and largely by plants. Deep in the ocean lies the world’s largest active carbon reservoir, which plays a pivotal role in buffering our planet’s climate. Of the roughly 10 billion metric tons of carbon dioxide we emit each year, about 3 billion metric tons are taken up and stored in the oceans—and largely by plants. Earth Sciences Environment Phys.org – latest science and technology news stories