80 Climate Change: what do we know?
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The climate is warming: no doubts about it! Based on observation data!
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More than 100 years of warming in atmosphere
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Global increase in sea temperature, widespread melting of snow, glaciers, ice sheets, permafrost melting; global sea level rise
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Referred to as global warming (meaning that no other possibilities exist!). Can we get colder again?
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90% probability that humans are responsible (starting from Industrial Revolution era, late 19th century)
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Changes in atmosphere are linked with lithosphere, cryosphere, hydrosphere, and biosphere
Sea-level Variations:
This is a global geologic phenomenon! Last 24,000 years!
Source: https://en.wikipedia.org/wiki/Early_Holocene_sea_level_rise
See below data sets and statistical analyses of variations in sea level from 30,000 calendar years.
Note that the range varies from over 150 m (panel A) to 60 cm (panel B), 30 cm (panel C), and over 5 m (panels D, E).
Source: Miller, K.G., W.J. Schmelz, J.V. Browning, R.E. Kopp, G.S. Mountain, and J.D. Wright. 2020. Ancient sea level as key to the future. Oceanography 33(2):32–41, https://doi.org/10.5670/oceanog.2020.224.