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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".
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]
An early (2018) warming stripes graphic published by their originator, climatologist Ed Hawkins. [1] The progression from blue (cooler) to red (warmer) stripes portrays annual increases of global average temperature since 1850 (left side of graphic) until the date of the graphic (right side).
In the 1980s, the terms global warming and climate change became more common, often being used interchangeably. [29] [30] [31] 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. [28]
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
Global warming affects all parts of Earth's climate system. [19] Global surface temperatures have risen by 1.1 °C (2.0 °F). Scientists say they will rise further in the future. [20] [21] The changes in climate are not uniform across the Earth. In particular, most land areas have warmed faster than most ocean areas.
Record heat throughout the country resulted in 502 deaths nationwide. [18] There were many deaths in urban centers of the Midwest. 2000 – in late Summer 2000, a heat wave occurred in the southern United States, breaking many cities' all-time maximum temperature records.