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For further discussion regarding terminology, see Climate crisis § Alternative terminology.

Climate emergency as a term was used in protests against climate change before 2010 (e.g. the "Climate-Emergency-Rally" in Melbourne in June 2009). In 2017 the city council of Darebin adopted multiple measures named "Darebin Climate Emergency Plan". On 4 December 2018, the Club of Rome presented their "Climate Emergency Plan", which included 10 high-priority measures to limit global warming. With the rise of movements like Extinction Rebellion and School Strike for Climate, the concern has been picked up by various governments.

Multiple European cities and communities who declared a climate emergency are simultaneously members of the Klima-Bündnis (German for climate alliance), which obligates them to lower their CO2 emissions by 10% every five years.

Oxford Dictionary chose climate emergency as the word of the year 2019 and defines the term as "a situation in which urgent action is required to reduce or halt climate change and avoid potentially irreversible environmental damage resulting from it." Usage of the term soared more than 10,000% between September 2018 and September 2019.