Carbon negative is an adjectival phrase used to describe any process that removes carbon. The term also refers to lifestyles or institutions that remove more carbon from the atmosphere than they release into it.
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A carbon dioxide sink such as plants, algae or any other primary producer that binds carbon dioxide into biomass are not carbon negative but carbon neutral. A carbon dioxide sink of this type moves carbon, in the form of carbon dioxide, from the atmosphere or hydrosphere to the biosphere. That carbon will return to the atmosphere or hydrosphere in the form of carbon dioxide as a part of the carbon cycle.
Carbon dioxide sinks that store carbon dioxide in the Earth's crust (geological sequestration) or in the form of insoluble carbonate salts (mineral sequestration) are carbon negative.
With the current trend for companies to be seen to acting on the environment and become carbon neutral there has now an emerging trend for some organisations to go beyond this and try to become carbon negative, this is the process of offsetting more than 100% of carbon emissions normally about 110%.
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