Coal
Net Zero by 2050, A Roadmap for the Global Energy Sector, published by the International Energy Agency in May 2021, suggests: ‘Coal: Includes both primary coal (including lignite, coking and steam coal) and derived fuels (including patent fuel, brown-coal briquettes, coke-oven coke, gas coke, gas-works gas, cokeoven gas, blast furnace gas and oxygen steel furnace gas). Peat is also included.’
The glossary of statistical terms, published by the Organisation for Economic Co-operation and Development (OECD), states: 'Coal is a family name for a variety of solid organic fuels and refers to a whole range of combustible sedimentary rock materials spanning a continuous quality range. For convenience, this continuous series is divided into four categories:
- 'anthracite
- 'bituminous coal
- 'sub-bituminous coal
- 'lignite'
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