A carbon sink is a natural or artificial reservoir that absorbs more carbon than it releases. These carbon sinks store greenhouse gases (GHGs), aerosols or precursors of a GHGs, for an indefinite period of time and therefore remove carbon dioxide from the atmosphere. In earth, the three most important carbon sinks are vegetation, soil and the ocean.

Carbon sinks are vital to the fight against global warming, and due to depletion for decades of these natural sinks, efforts are been allocated to artificial processes of carbon capture and storage to aid the total carbon sink capacity of the planet.

Examples of methods by which our world is storing carbon are in the use of innovative construction materials, that delay considerable the release of the carbon or even make use of it, and technology that collect carbon directly from the air and convert it into a durable material.

Source: Earth.org