In this subtitle the following words have the meanings indicated. “Gas” means any natural gas or other fluid hydrocarbons that are produced from a natural reservoir. “Gas” includes: Carbon dioxide; and Hydrogen sulfide. “Offshore drilling activity” means: The exploration, development, or production of oil or gas in, on, or under the federal outer continental shelf waters; and Transporting oil or gas by pipeline, ship, or otherwise from a specific site of exploration, development, or production of oil or gas on the federal outer continental shelf. “Oil” means oil of any kind or in any form, including petroleum, petroleum by–products, fuel oil, sludge, crude oil, oil refuse, and oil mixed with wastes.