In this section the following words have the meanings indicated. “Conservation land” means real property that is: subject to a perpetual conservation easement donated to a land trust, the Department of Natural Resources, or the Maryland Environmental Trust on or after July 1, 1991; acquired by a land trust on or after July 1, 1991; and owned in fee by that land trust; owned by the Potomac Conservancy; or owned by the Western Shore Conservancy. “Land trust” means a qualified conservation organization as defined in § 3-2A-01 of the Natural Resources Article. The Mayor and City Council of Baltimore City or the governing body of a county or municipal corporation may grant, by law, a property tax credit against the county or municipal corporation property tax imposed on conservation land or property owned by a land trust that qualifies under subsection (d) of this section, that is used: to assist in the preservation of a natural area; for the environmental education of the public; generally to promote conservation; for the maintenance of: a natural area for public use; or a sanctuary for wildlife; or to conserve agricultural land and to promote continued agricultural use of the land. The Mayor and City Council of Baltimore City or the governing body of a county or municipal corporation may provide, by law, for: the amount and duration of the property tax credit under this section; and any other provision necessary to carry out the property tax credit under this section. To qualify for a property tax credit under this section, a land trust shall: be certified by the Maryland Environmental Trust to be a land trust in good standing and to have a cooperative agreement in effect; and obtain a written certification every 5 years beginning July 1, 1998, or as scheduled by the Maryland Environmental Trust.