As used in this part 3, unless the context otherwise requires:(1) 'Landfill-generated methane gas' means those gases resulting from the biological decomposition of landfilled solid wastes, including methane, carbon dioxide, hydrogen, and traces of other gases, and shall be referred to in this part 3 as 'landfill gas'.(1.5) 'Oil and gas' means oil, gas, casinghead gas, condensate, and hydrocarbons or any one or more of them.(2) 'Real estate owned by a county' and 'county lands' means any real estate acquired and owned by a county under the laws relating to taxation or otherwise.L. 49: p. 328, § 5. CSA: C. 45, § 25(5). CRS 53: § 36-11-5. C.R.S. 1963: § 36-11-5. L. 80: (1) amended and (1.5) added, p. 651, §§ 1, 2, effective July 1. For definitions applicable to this article, see § 30-26-301(2)(d).