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Climate data for Tucson, Arizona (Tucson Int'l), 1991–2020 normals, [a] extremes 1894−present [b]Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C)
Older Peron warm and wet, global sea levels were 2.5 to 4 meters (8 to 13 feet) higher than the twentieth-century average 3900: 5.9 kiloyear event dry and cold. 3500: End of the African humid period, Neolithic Subpluvial in North Africa, expands Sahara Desert 3000 – 0: Neopluvial in North America 3,200–2,900: Piora Oscillation, cold
Scientific consensus on causation: Academic studies of scientific agreement on human-caused global warming among climate experts (2010–2015) reflect that the level of consensus correlates with expertise in climate science. [437] A 2019 study found scientific consensus to be at 100%, [438] and a 2021 study concluded that consensus exceeded 99% ...
The explosion had effects on climate around the Northern Hemisphere (Southern hemispheric records are less complete), where 1601 was the coldest year in six centuries, leading to a famine in Russia; see Russian famine of 1601–1603. [16] 1610
By far the best observed period is from 1850 to the present day, with coverage improving over time. Over this period the recent instrumental record, mainly based on direct thermometer readings, has approximately global coverage. It shows a general warming in global temperatures. Before this time various proxies must be used.
However, this reduction was a result of reduced economic activity, not the decarbonization of the economy required to respond to climate change. [22] The Global Carbon Project estimated that global daily CO 2 emissions may have been reduced by 17% during the most intense periods of COVID-19 shutdowns, but the WMO's Greenhouse Gas Bulletin ...
17 May: the WMO Global Annual to Decadal Climate Update projected that the chance of global near-surface temperature exceeding 1.5 °C above preindustrial levels for at least one year between 2023 and 2027 is 66%, though it is unlikely (32%) that the five-year mean will exceed 1.5 °C.
The Climate Attribution Database contains scientific resources organized by theme. [15] A study of 2020 storms of at least tropical storm-strength published in Nature Communications concluded that human-induced climate change increased extreme 3-hourly storm rainfall rates by 10%, and extreme 3-day accumulated rainfall amounts by 5%. [16]