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Basically, carbon sinks are holding tanks for carbon or carbon compounds, like carbon dioxide (CO2). One of the largest reservoirs of carbon is the Earthâs hard rock crust. Over the eons sedimentary rocks were formed that contain loads of carbon compounds, including the hydrocarbons that we now use as fossil fuels.
The Orbiting Carbon Observatory will regularly map carbon dioxide sinks -- places where carbon dioxide is pulled out of the atmosphere and stored, such as the carbon stored by plants during photosynthesis. Image credit: NASA But what about the rest? The math doesn't add up. For years, scientists have sought to find the answer to this mystery.