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These numbers show that awareness of global warming was increasing in the United States. [300] A Gallup poll showed that 62% of Americans believe that the effects of global warming were happening in 2017. [301] In 2019, Gallup poll found that one-third of Americans blame unusual winter temperatures on climate change. [302]
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.
D'Arrigo, Wilson & Jacoby 2006 "On the long-term context for late twentieth century warming". Osborn & Briffa 2006 "The spatial extent of 20th-century warmth in the context of the past 1200 years". Hegerl et al. 2006 "Climate sensitivity constrained by temperature reconstructions over the past seven centuries".
[79] [82] Senator James M. Inhofe stated his belief that "manmade global warming is the greatest hoax ever perpetrated on the American people", [10] [83] and a hearing of the United States Senate Committee on Environment and Public Works which he convened on 29 July 2003 heard the news of the resignations.
Global warming projections from AR4 [3] are shown below. The projections apply to the end of the 21st century (2090–2099), relative to temperatures at the end of the 20th century (1980–1999). Add 0.7 °C to projections to make them relative to pre-industrial levels instead of 1980–1999. (UK Royal Society, 2010, p=10 [citation needed]). [5]
The initial concept of visualizing historical temperature data has been extended to involve animation, [10] to visualize sea level rise [11] and predictive climate data, [12] and to visually juxtapose temperature trends with other data such as atmospheric CO 2 concentration, [13] global glacier retreat, [14] precipitation, [4] progression of ...
The key conclusions of Working Group I [11] were: . An increasing body of observations gives a collective picture of a warming world and other changes in the climate system (The global average surface temperature has increased over the 20th century by about 0.6 °C; Temperatures have risen during the past four decades in the lowest 8 kilometres of the atmosphere; Snow cover and ice extent have ...
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