Fossil Fuels

noun a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground deposits and widely used as fuel

• Coal is a fossil fuel that is commonly used for electricity generation.
• My grandfather used to work in the coal mines when he was younger.
• I'm so tired, I feel like I've been coal mining all day.
• His heart was as black as coal after what he did.

noun a colorless, odorless flammable gas that is the main constituent of natural gas and is used as a fuel

• Methane is a colorless, odorless gas that is the main component of natural gas.
• Did you know that methane is a greenhouse gas that contributes to global warming?
• Some people call methane 'fart gas' because it is produced by animals when they pass gas.
• His jokes were like methane, spreading quickly and leaving everyone gasping for air.

noun a flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as fuel

• The country relies heavily on natural gas as a source of energy.
• We use natural gas to heat our home during the winter.
• I love cooking with natural gas because it's so efficient.
• Her laughter was like a burst of natural gas, filling the room with warmth and light.

noun a solid particle produced during incomplete combustion of fossil fuels, biofuels, and biomass

adjective describing the color and composition of the carbon particle

• Black carbon is a type of particulate air pollution that is released from burning fossil fuels.
• Hey, did you know that black carbon is a major contributor to global warming?
• I heard that black carbon is like the bad boy of air pollution, causing all sorts of trouble.
• The presence of black carbon in the atmosphere is like a dark cloud hanging over our environmental efforts.