Portal:Global Warming
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Portal:Global Warming

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1999-2008 Mean temperatures: This figure shows the difference in instrumentally determined surface temperatures between the period January 1999 through December 2008 and "normal" temperatures at the same locations, defined to be the average over the interval January 1940 to December 1980. The average increase on this graph is 0.48 °C, and the widespread temperature increases are considered to be an aspect of global warming. Source: NASA

Global warming is the mainly human-caused rise of the average temperature of the Earth's climate system and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming. It is a major aspect of climate change which, in addition to rising global surface temperatures, also includes its effects, such as changes in precipitation. While there have been prehistoric periods of global warming, observed changes since the mid-20th century have been unprecedented in rate and scale.

The Intergovernmental Panel on Climate Change (IPCC) concluded that, "human influence on climate has been the dominant cause of observed warming since the mid-20th century". These findings have been recognized by the national science academies of major nations and are not disputed by any scientific body of national or international standing. The largest human influence has been the emission of greenhouse gases such as carbon dioxide, methane, and nitrous oxide. Fossil fuel burning is the principal source of these gases, with agricultural emissions and deforestation also playing significant roles.

The effects of global warming include rising sea levels, regional changes in precipitation, more frequent extreme weather events such as heat waves, and expansion of deserts. Surface temperature increases are greatest in the Arctic, which have contributed to the retreat of glaciers, permafrost, and sea ice. Overall, higher temperatures bring more rain and snowfall, but for some regions droughts and wildfires increase instead. Climate change threatens to diminish crop yields, harming food security, and rising sea levels may flood coastal infrastructure. Environmental impacts include the extinction or relocation of many species as their ecosystems change, most immediately in coral reefs, mountains, and the Arctic. Some impacts, such as loss of snow cover, increased water vapour, and melting permafrost, cause feedback effects that further increase the rate of global warming. Ocean acidification caused by increased levels is commonly grouped with these effects even though it is not driven by temperature.

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Global warming was the cover story of this 2007 issue of the liberal-leaning feminist Ms. magazine

Media coverage of global warming has had effects on public opinion on climate change, as it mediates the scientific opinion on climate change that the global instrumental temperature record shows increase in recent decades and that the trend is caused mainly by human-induced emissions of greenhouse gases. Almost all scientific bodies of national or international standing agree with this view, although a few organisations hold non-committal positions.

Media attention is especially high in carbon dependent countries with commitments under the Kyoto Protocol. The way the media report on climate change in English-speaking countries, especially in the United States, has been widely studied, while studies of reporting in other countries have been less expansive. A number of studies have shown that particularly in the United States and in the UK tabloid press, the media significantly understated the strength of scientific consensus on climate change established in IPCC Assessment Reports in 1995 and in 2001. Read more...

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Impacts of Global Warming.png
Credit: GRID-Arendal

Graph summarizing some of the expected impacts of Global Warming according to the Intergovernmental Panel on Climate Change. Temperature deviations are from 1990 readings.

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From the Wikinews Climate change category
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  • 2019 was the Northern Hemisphere's hottest summer since records began, according to NOAA.[1]
  • This winter was Europe's hottest since records began.[1]

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Hurricane Isabel from ISS.jpg
...that ocean warming has been found to result in stronger hurricanes? Article on Nature News

(Pictured left: Hurricane Isabel (2003) as seen from orbit during Expedition 7 of the International Space Station. )

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NOAA sea level trend 1993 2010.png

Sea level trends between 1993 and 2010. Per the U.S. National Oceanic and Atmospheric Administration (NOAA), "The following maps provide estimates of sea level rise based on measurements from satellite radar altimeters. The local trends were estimated using data from TOPEX/Poseidon (T/P), Jason-1, and Jason-2, which have monitored the same ground track since 1992.

An inverted barometer has been applied. The estimates of sea level rise do not include glacial isostatic adjustment effects on the geoid, which are modeled to be +0.2 to +0.5 mm/year when globally averaged."

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References

  1. ^ Carrington, Damian (2020-03-05). "This winter in Europe was hottest on record by far, say scientists". The Guardian. ISSN 0261-3077. Retrieved .

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