global warming

noun

: an increase in the earth's atmospheric and oceanic temperatures widely predicted to occur due to an increase in the greenhouse effect resulting especially from pollution
A Russian-owned tanker, built to traverse the frozen waters of the Arctic, completed a journey in record time from Europe to Asia this month, auguring the future of shipping as global warming melts sea ice.Russell Goldman
Debates about stem cells, global warming, and alternative energy might be less contentious if the scientific issues behind them were better understood.Elizabeth Gettelman
The development is also meant to boost tourism in Zermatt, which, like many Alpine towns worried about the effects of global warming on winter tourism, is exploring ways to draw visitors throughout the year.Jim Rendon
… I think it makes a compelling case, at least for most audiences, that humans are the cause of most of the global warming that is taking place, and that unless we take quick action the consequences for our planetary home could become irreversible.Al Gore

Examples of global warming in a Sentence

Recent Examples on the Web
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This makes deforestation an important contributor to global warming. Marianne Krasny, Forbes.com, 16 Sep. 2025 In 2015, Redford was among a group of celebrities who gathered in Paris to help encourage the United Nations to strengthen their stance on global warming. Alexandra Schonfeld, PEOPLE, 16 Sep. 2025 Plans to end global warming hinge on driving net greenhouse gas emissions to zero (plus or minus a few gigatonnes). IEEE Spectrum, 15 Sep. 2025 Nitrous oxide is responsible for more than 10% of global warming to date, and between 1980 and 2020 emissions of this gas rose 40%. Katherine Bourzac, Quanta Magazine, 15 Sep. 2025 See All Example Sentences for global warming

Word History

First Known Use

1953, in the meaning defined above

Time Traveler
The first known use of global warming was in 1953

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Cite this Entry

“Global warming.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/global%20warming. Accessed 19 Sep. 2025.

Kids Definition

global warming

noun
: a warming of the earth's atmosphere and oceans that is widely predicted to result from an increase in the greenhouse effect caused by air pollution

More from Merriam-Webster on global warming

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