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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).
English: Three charts of global average temperature three respective time periods: 800,000 years, 2,000 years, and 139 years, showing current global warming in the perspective of geologic time.
According to IPCC Sixth Assessment Report, in the last 170 years, humans have caused the global temperature to increase to the highest level in the last 2,000 years. The current multi-century period is the warmest in the past 100,000 years. [3] The temperature in the years 2011-2020 was 1.09 °C higher than in 1859–1890.
A mass extinction event that brought about the rise of the dinosaurs more than 200 million years ago was believed to be caused by the planet’s warming. Now, scientists at Columbia University say ...
English: Two charts of global average temperature over respective time periods: 2,000 years and 139 years, showing current global warming in perspective. SOURCES (and related explanations): 1. Top chart (2,000 years): Wikimedia image file File:Temperature reconstruction last two millennia.svg by User talk:Femkemilene; 2. Bottom chart (139 years):
To graph this data (and to meet Microsoft Excel's need for regularly-spaced x-axis values), uploader RCraig09 took data ranging from 10,000 to 20,000 years ago, and mapped each datapoint to the nearest 20-year interval.
A study in 2020 estimated that the average global temperature during the warmest 200 year period of the HCO, around 6,500 years ago, was around 0.7 °C warmer than the mean for nineteenth century AD, immediately before the Industrial Revolution, and 0.3 °C cooler than the average for 2011-2019. [6]
‘Not normal’: Social media reacts after Trump makes bizarre comments about a fly he’s bothered by on stage