carbon dioxide
noun
: a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages
Examples of carbon dioxide in a Sentence
Recent Examples on the Web
Recycling nationwide is responsible for more than 680,000 jobs, conserving resources, and reducing greenhouse gas emissions that contribute to climate change by keeping more than 190 million metric tons of carbon dioxide out of the air, according to the EPA.
—
Tara Molina, CBS News, 23 Jan. 2026
Nuveen said upgrades financed by its C-PACE lending have saved over 300,000 metric tons of carbon dioxide.
—Diana Olick, CNBC, 23 Jan. 2026
Each year, vast blooms of phytoplankton spread across the Southern Ocean, drawing carbon dioxide from the atmosphere and fueling Antarctica’s marine food web.
—New Atlas, 22 Jan. 2026
Karman has developed a cooling system similar to the heat pumps in the average home, except its pumps use liquid carbon dioxide as refrigerant, which is circulated using rocket engine technology rather than fans.
—Los Angeles Times, 22 Jan. 2026
See All Example Sentences for carbon dioxide
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Tara Molina, CBS News, 23 Jan. 2026
Nuveen said upgrades financed by its C-PACE lending have saved over 300,000 metric tons of carbon dioxide.
—Diana Olick, CNBC, 23 Jan. 2026
Each year, vast blooms of phytoplankton spread across the Southern Ocean, drawing carbon dioxide from the atmosphere and fueling Antarctica’s marine food web.
—New Atlas, 22 Jan. 2026
Karman has developed a cooling system similar to the heat pumps in the average home, except its pumps use liquid carbon dioxide as refrigerant, which is circulated using rocket engine technology rather than fans.
—Los Angeles Times, 22 Jan. 2026
See All Example Sentences for carbon dioxide
Cite this Entry
“Carbon dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/carbon%20dioxide. Accessed 25 Jan. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
