"Sequestered carbon" refers to carbon dioxide (CO2) that has been captured and stored, usually deep underground, to prevent it from entering the atmosphere. This helps to reduce the amount of CO2 contributing to climate change. Full definition
Solidia Technologies sequesters carbon dioxide in concrete itself. (scientificamerican.com)
Plants release some carbon when their leaves fall and decay in the autumn, and when the plants die they also sequester carbon in the soil. (ase.tufts.edu)
(The law covers up to 75 million metric tons of sequestered carbon from all sources; PurGen will generate 5 million tons per year.) (discovermagazine.com)