Global wairming an climate chynge are terms for the observed century-scale rise in the average temperatur o the Yird's climate seetem an its relatit effects. Multiple lines o scienteefic evidence shaw that the climate seestem is wairmin. Mony o the observed chynges syne the 1950s are unprecedentit ower tens tae thoosands o years.
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- Gillis, Justin (28 November 2015). "Short Answers to Hard Questions About Climate Change". The New York Times. Retrieved 29 November 2015.
- Simpson, John. Oxford English Dictionary.
(Global warming is a) gradual increase in the overall temperature of the earth’s atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFC’s, and other pollutants.
- Hartmann, D. L.; Klein Tank, A. M. G.; Rusticucci, M. (2013). "2: Observations: Atmosphere and Surface" (PDF). IPCC WGI AR5 (Report). p. 198.
Evidence for a warming world comes from multiple independent climate indicators, from high up in the atmosphere to the depths of the oceans. They include changes in surface, atmospheric and oceanic temperatures; glaciers; snow cover; sea ice; sea level and atmospheric water vapour. Scientists from all over the world have independently verified this evidence many times.
- "Myth vs Facts..." EPA (US). 2013.The U.S. Global Change Research Program, the National Academy of Sciences, and the Intergovernmental Panel on Climate Change (IPCC) have each independently concluded that warming of the climate system in recent decades is 'unequivocal'. This conclusion is not drawn from any one source of data but is based on multiple lines of evidence, including three worldwide temperature datasets showing nearly identical warming trends as well as numerous other independent indicators of global warming (e.g., rising sea levels, shrinking Arctic sea ice).
- Borenstein, Seth (29 November 2015). "Earth is a wilder, warmer place since last climate deal made". Retrieved 29 November 2015.
- IPCC, Climate Change 2013: The Physical Science Basis - Summary for Policymakers, Observed Changes in the Climate System, p. 2, in IPCC AR5 WG1 2013. "Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia."