First attested in the 1950s. Came into common use in the mid-1970s with Wallace Smith Broecker's paper “Climatic Change: Are We on the Brink of a Pronounced Global Warming?”[1] and Mikhail Budyko's statement in 1976 that “a global warming up has started”.
2004 May 17, Lev Grossman, “Hollywood's Global Warming”, in Time[4], archived from the original on 2011-06-28:
As a movie, The Day After Tomorrow is your classic computer-generated cinematic confection, only the bad guy isn't an alien or a giant lizard, it's global warming.
In the popular imagination, global warming is mostly seen as a threat to cold-loving species, and there are good reasons for this. […] But global warming is going to have just as great an impact—indeed, according to Silman, an even greater impact—in the tropics.
2015 March 2, Ian Sample, “Global warming contributed to Syria's 2011 uprising, scientists claim”, in The Guardian[5]:
The study is one of the first to implicate global warming from human activities as one of the factors that played into the Syrian conflict which is estimated to have claimed more than 190,000 lives.
2022 August 16, “Tibetan Plateau water stores under threat: study”, in France 24[6], archived from the original on 16 August 2022[7]:
The Tibetan Plateau will experience significant water loss this century due to global warming, according to research published Monday that warns of severe supply stress in a climate change "hotspot".
May be treated as a synonym of climate change in informal contexts, particularly in regions where climate science is contested by political actors. This conflation is not widespread in scientific contexts, where it may be regarded as incorrect.
^ Wallace S. Broecker (1975 August 8) “Climatic Change: Are We on the Brink of a Pronounced Global Warming?”, in Science, volume 189, number 4201, →DOI
^ Brigitte Nerlich (2014 February 4) “Global warming is dead, long live global heating?”, in University of Nottingham[1]
^ Jonathan Watts (2018 December 13) “Global warming should be called global heating, says key scientist”, in The Guardian[2]
^ Damian Carrington (2019 May 17) “Why the Guardian is changing the language it uses about the environment”, in The Guardian[3]