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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
This timeline lists events in the external environment that have influenced events in human history. This timeline is for use with the article on environmental determinism. For the history of humanity's influence on the environment, and humanity's perspective on this influence, see timeline of history of environmentalism.
In the 1980s, the terms global warming and climate change became more common, often being used interchangeably. [118] [119] [120] Scientifically, global warming refers only to increased surface warming, while climate change describes both global warming and its effects on Earth's climate system, such as precipitation changes. [117]
Environmental History Timeline; Firstgov.gov – various United States government sites; The Evolution of the Conservation Movement, (1850–1920) — The Library of Congress; The Global Environmental Movement, John McCormick (London: John Wiley, 1995). American Earth: Environmental Writing Since Thoreau, Bill McKibben, ed; Al Gore, fwd., (New ...
Global drop in sea level? [38] Ireviken event: 428 Ma: Deep-ocean anoxia; [39] Milankovitch cycles? [40] Ordovician: Late Ordovician mass extinction: 445-444 Ma Global cooling and sea level drop, and/or global warming related to volcanism and anoxia [41] Cambrian: Cambrian–Ordovician extinction event: 488 Ma: Kalkarindji Large Igneous ...
Scientists warn that if carbon dioxide and other greenhouse gas emissions continue to rise at their current rates, Earth’s temperatures could increase dramatically in future decades, leading to catastrophic and irreversible climate change. The 10 largest emitters produced about 26.4 gigatons of carbon dioxide in 2013.
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.
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