Combustion

noun a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container in which it is placed

• The gas in the atmosphere contributes to the greenhouse effect.
• I need to fill up my car with gas before we head out.
• Let's stop at the gas station and grab some snacks.
• Her words were like gas on the fire, only making the situation worse.

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.