greenhouse gas

noun

: any of various gaseous compounds (such as carbon dioxide or methane) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect
Water vapor is an important gas for the study of climate and weather because of its role as a natural greenhouse gas as well as its relationship to clouds and precipitation.Mohi Kumar
Scientists now recognize tropospheric ozone—a component of smog—as a greenhouse gas as well as an eye and lung irritant.Science News
While it may not be possible to eliminate all greenhouse gas emissions, it is possible to offset some of the emissions that do still occur. Offsetting involves supporting projects that reduce or sequester greenhouse gas emissions in another location.Tyson Miller
Livestock emit 14.5 percent of all greenhouse gas emissions each year. Most of that is from cows.Marley Walker

Examples of greenhouse gas in a Sentence

Recent Examples on the Web
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The technology can raise greenhouse gas emissions and has been shown to increase temperatures in cities where it’s widely used. Christopher Cann, USA Today, 2 July 2026 It's been estimated that standby power can account for up to 10% of your household electric bill and 1% of greenhouse gas emissions. ABC News, 1 July 2026 Lawmakers said the goal is to increase housing supply, help ease housing costs and encourage more people to use public transportation, which could reduce greenhouse gas emissions. Angela Rodriguez, Sacbee.com, 1 July 2026 This is because, just like greenhouse gases trap heat, moisture holds onto heat in the atmosphere. Adriana Pérez, Chicago Tribune, 29 June 2026 See All Example Sentences for greenhouse gas

Word History

First Known Use

1975, in the meaning defined above

Time Traveler
The first known use of greenhouse gas was in 1975

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Cite this Entry

“Greenhouse gas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/greenhouse%20gas. Accessed 6 Jul. 2026.

Kids Definition

greenhouse gas

noun
: any of various gases (as carbon dioxide or methane) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect
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