Portfolio 21 does not invest in companies directly involved in the extraction and production of fossil fuels ─coal, oil, and natural gas. However, due to the current limitations of renewable energy resources (in terms of current capacity and financial attractiveness), Portfolio 21 will invest in companies involved in the transmission and distribution of natural gas, as well as utilities that utilize natural gas as a fuel source. Natural gas has a lower greenhouse gas (GHG) emissions profile than either oil or coal. Despite natural gas’s lower GHG profile, it is a combustible mixture of hydrocarbon gases, formed primarily of methane. Deposits are found at varying depths beneath the Earth’s crust, both onshore and offshore, requiring the use of both conventional and unconventional extraction methods. Given the elevated environmental risks associated with extraction, Portfolio 21 will not invest in extraction and production.