carbon dioxide
noun [ U ]
ukus(also carbon); ( abbreviation CO2) ENVIRONMENT
the gas formed when carbon is burned, or when people or animals breathe out. Carbon dioxide is a greenhouse gas:
The UK plans to reduce carbon dioxide emissions by 60% by 2050.
Hotter days could be ahead as the carbon dioxide levels in Earth's atmosphere continue to rise.
emit/release carbon dioxide Human energy consumption releases carbon dioxide into the atmosphere.
absorb/capture carbon dioxide
Compare
carbon monoxide