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Two years ago a team of scientists visited Costa Rica’s subduction zone, where the ocean floor sinks beneath the continent and volcanoes tower above the surface. They wanted to find out if microbes can affect the cycle of carbon moving from Earth’s surface into the deep interior. According to their new study in Nature, the answer is yes.

Biofilm in a natural seep in Costa Rica
Biofilm in a natural seep in Costa Rica. Credit: Peter Barry
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