### Question
How is the "greenhouse gas" defined?


### Answer
The term **greenhouse gas** is defined in *22 U.S.C. § 7901* as follows -

> carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride

#### Citation:
  - *22 U.S.C. § 7901*
  - Heading: **CHAPTER 86-CLIMATE CHANGE TECHNOLOGY DEPLOYMENT IN DEVELOPING COUNTRIES**

