What is carbon sequestration?

Carbon sequestration describes the process in which carbon dioxide (CO₂) is removed from the atmosphere and subsequently stored through biological, chemical, or physical processes.

How do trees sequester carbon?

In the case of woodland creation, trees use solar energy to convert CO₂ and water into carbohydrates and oxygen through photosynthesis. These carbohydrates form the building blocks for the biomass of the tree and, therefore, the storage of carbon.

Do trees emit carbon?

One often forgotten caveat is that trees not only photosynthesise but respire also. Through this process, trees convert some of these carbohydrates and oxygen back into CO₂, water, and energy.

As trees grow, the process of photosynthesis dominates that of respiration, sequestering carbon. Once they reach maturity, however, these processes are pretty much in equilibrium. Subsequently, the trees are emitting as much CO₂ as they are sequestering.

What is a carbon sink?

A carbon sink is any reservoir that absorbs more carbon than it releases.

What is a carbon source?

A carbon source releases more carbon than it absorbs.

What is a carbon store?

A carbon store/stock maintains a constant amount of carbon.

What is a Pending Issuance Unit (PIU)?

A Pending Issuance Unit (PIU) is a ‘promise to deliver’ a Woodland Carbon Unit in the future. For more information visit CarbonStore’s ‘Carbon Units Explained‘ page


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Pending Issuance Unit: A promise to deliver a Woodland Carbon Unit during a given period, based on the trees’ predicted growth Woodland Carbon Unit: A ton of carbon dioxide which has been sequestered in a scheme verified under the Woodland Carbon Code