# § 7901. Definitions
In this chapter:
**(1)** **Carbon sequestration** The term “carbon sequestration” means the capture of carbon dioxide through terrestrial, geological, biological, or other means, which prevents the release of carbon dioxide into the atmosphere.
**(2)** **Greenhouse gas** The term “greenhouse gas” means carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride.
**(3)** **Greenhouse gas intensity** The term “greenhouse gas intensity” means the ratio of greenhouse gas emissions to economic output.
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**Source Credit**: (Pub. L. 101–240, title VII, § 731, as added Pub. L. 109–58, title XVI, § 1611, Aug. 8, 2005, 119 Stat. 1113.)
## Statutory Notes and Related Subsidiaries
### Effective Date
> “Except as otherwise provided in this part [part C (§§ 731–739) of title VII of
>
> , enacting this chapter], this part takes effect on
>
> .”
, as added , , , provided that:
## Executive Documents
### Executive Order No. 14027
Ex. Ord. No. 14027, , 86 F.R. 25947, which established the Climate Change Support Office, was revoked by Ex. Ord. No. 14148, § 2(ff), , 90 F.R. 8238, and Ex. Ord. No. 14154, § 4(a)(vi), , 90 F.R. 8354.