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500 million years of climate change Ice core data for the past 400,000 years, with the present at right. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO 2, and red curve is windblown glacial dust (loess). Scale: Millions of years before present, earlier dates approximate.
Large-scale reconstructions covering part or all of the 1st millennium and 2nd millennium have shown that recent temperatures are exceptional: the Intergovernmental Panel on Climate Change Fourth Assessment Report of 2007 concluded that "Average Northern Hemisphere temperatures during the second half of the 20th century were very likely higher ...
Reconstruction of the past 5 million years of climate history, based on oxygen isotope fractionation in deep sea sediment cores (serving as a proxy for the total global mass of glacial ice sheets), fitted to a model of orbital forcing (Lisiecki and Raymo 2005) [2] and to the temperature scale derived from Vostok ice cores following Petit et al. (1999).
[238] [239] According to the World Economic Forum, 14.5 million more deaths are expected due to climate change by 2050. [242] 30% of the global population currently live in areas where extreme heat and humidity are already associated with excess deaths. [243] [244] By 2100, 50% to 75% of the global population would live in such areas. [243] [245]
Mann, Park & Bradley 1995 "Global interdecadal and century-scale climate oscillations during the past five centuries". Overpeck et al. 1997 "Arctic Environmental Change of the Last Four Centuries". Fisher 1997 "High resolution reconstructed Northern Hemisphere temperatures for the last few centuries: using regional average tree ring, ice core ...
Amardeo Sarma lecturing about climate change denialism at the European Skeptics Congress, hosted by the Association for Skeptical Enquiry. A global warming hiatus, [1] also sometimes referred to as a global warming pause [2] or a global warming slowdown, [3] is a period of relatively little change in globally averaged surface temperatures. [4]
In addition to global climate variability and global climate change over time, numerous climatic variations occur contemporaneously across different physical regions. The oceans' absorption of about 90% of excess heat has helped to cause land surface temperatures to grow more rapidly than sea surface temperatures. [132]
Projected global surface temperature changes relative to 1850–1900, based on CMIP6 multi-model mean changes. The IPCC Sixth Assessment Report defines global mean surface temperature (GMST) as the "estimated global average of near-surface air temperatures over land and sea ice, and sea surface temperature (SST) over ice-free ocean regions, with changes normally expressed as departures from a ...
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