The Carbon Underground 200™, compiled and maintained by FFI Solutions (formerly Fossil Free Indexes℠), identifies the top 100 coal and the top 100 oil and gas publicly-traded reserve holders globally, ranked by the potential carbon emissions content of their reported reserves.
Rankings are constructed using a reserves-based methodology with the underlying core data based on “reported” reserves. Coal reserves are the sum of proven and probable reserves based on the last reported reserves amount by mine. Reserves are allocated to listed companies based on percentage ownership of individual mines. Oil and gas companies are ranked on proven reserves (1P) net of royalty payments.
The Carbon Underground 200™ relies on the IPCC Revised 1996 Guidelines for National Greenhouse Gas Inventories as a methodological framework. The calculation of CO2 emission potential requires several conversions to the raw reserves figure.