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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]
Countries agreed in the landmark 2015 Paris Agreement to limit global warming to 1.5 degrees C (2.7 degrees F) above preindustrial times to avert the most catastrophic consequences of climate change.
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.
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.
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. [1] [2] The clock is updated every year to reflect the latest global CO 2 emissions trend and rate of climate warming. [1]
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".
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).
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.