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The Climate Clock was launched in 2015 to provide a measuring stick against which viewers can track climate change mitigation progress. The date shown when humanity reaches 1.5°C will move closer as emissions rise, and further away as emissions decrease. An alternative view projects the time remaining to 2.0°C of warming.
Each of these effects occur cyclically. For example, the eccentricity changes over time cycles of about 100,000 and 400,000 years, with the value ranging from less than 0.01 up to 0.05. [45] [46] This is equivalent to a change of the semiminor axis of the planet's orbit from 99.95% of the semimajor axis to 99.88%, respectively. [47]
While hiatus periods have appeared in surface-air temperature records, other components of the climate system associated with warming have continued. Sea level rise has not stopped in recent years, [30] and Arctic sea ice decline has continued. There have been repeated records set for extreme surface temperatures. [31] [32] [33]
World leaders are meeting in Paris this month in what amounts to a last-ditch effort to avert the worst ravages of climate change. Climatologists now say that the best case scenario — assuming immediate and dramatic emissions curbs — is that planetary surface temperatures will increase by at least 2 degrees Celsius in the coming decades.
To the question "How convinced are you that most of recent or near future climate change is, or will be, a result of anthropogenic causes?", 47.7% had very much agreed, 26% agreeing to a large extent (6), 9.8% to a small extent (2–4), and 1.9% did not agree at all (1). 46% had very much agreed that climate change "poses a very serious and ...
To determine the past climate, Wade and a team of researchers used analyzed isotopes in more than 1,500 fossils of tiny, shelled organisms that lived in the sea at the time known as foraminifera.
Climate change can also be used more broadly to include changes to the climate that have happened throughout Earth's history. [32] Global warming—used as early as 1975 [33] —became the more popular term after NASA climate scientist James Hansen used it in his 1988 testimony in the U.S. Senate. [34] Since the 2000s, climate change has ...
The "Special Report on Global Warming of 1.5 °C" (SR15) is cited by Greta Thunberg in her speeches "Wherever I Go I Seem to Be Surrounded by Fairy Tales" (United States Congress, Washington DC, 18 September 2019) and "We Are the Change and Change Is Coming" (Week For Future, Climate Strike, Montreal, 27 September 2019), both published in the ...