Portal:Global warming

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Global warming

Instrumental Temperature Record
Glacier Mass Balance
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Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans since the mid-twentieth century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005. The Intergovernmental Panel on Climate Change (IPCC) concludes that human-sourced greenhouse gases are responsible for most of the observed temperature increase since the middle of the twentieth century, and natural phenomena such as solar variation and volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward. These basic conclusions have been endorsed by more than 40 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries.

Climate model projections summarized in the latest IPCC report indicate that global surface temperature will probably rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century. The uncertainty in this estimate arises from the use of models with differing climate sensitivity, and the use of differing estimates of future greenhouse gas emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Although most studies focus on the period up to 2100, warming is expected to continue beyond 2100, even if emissions have stopped, because of the large heat capacity of the oceans and the lifespan of carbon dioxide in the atmosphere.

Pictured left: 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

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NASA-28yrs-Arctic-Warming.jpg
Credit: NASA

the Arctic temperature trend between August 1981 and July 2009. Due to global warming, which is exacerbated at the Arctic, there's a significant warming over this 28 year period.

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Prim GRES.jpg
Pictured left: A coal fired power plant in Luchegorsk, Russia. A carbon tax would tax electricity production using coal.

A carbon tax is an environmental tax levied on the carbon content of fuels. It's a form of carbon pricing. Carbon is present in every hydrocarbon fuel (coal, petroleum, and natural gas) and is released as carbon dioxide (CO
2
) when they are burnt. In contrast, non-combustion energy sources—wind, sunlight, hydropower, and nuclear—do not convert hydrocarbons to CO
2
. CO
2
is a heat-trapping "greenhouse" gas. Since GHG emissions caused by the combustion of fossil fuels are closely related to the carbon content of the respective fuels, a tax on these emissions can be levied by taxing the carbon content of fossil fuels at any point in the product cycle of the fuel.

Carbon taxes offer a potentially cost-effective means of reducing greenhouse gas emissions. From an economic perspective, carbon taxes are a type of Pigovian tax. They help to address the problem of emitters of greenhouse gases not facing the full (social) costs of their actions. Carbon taxes are a regressive tax, in that they disproportionately affect low-income groups. The regressive nature of carbon taxes can be addressed by using tax revenues to favour low-income groups.

A number of countries have implemented carbon taxes or energy taxes that are related to carbon content. Most environmentally related taxes with implications for greenhouse gas emissions in OECD countries are levied on energy products and motor vehicles, rather than on CO
2
emissions directly.


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Al gore presentation.jpg
Pictured left: Al Gore's speech on Global Warming at the University of Miami BankUnited Center, February 28, 2007.

Albert Arnold "Al" Gore, Jr. (born March 31, 1948) served as the 45th Vice President of the United States (1993–2001), under President Bill Clinton. He was the Democratic Party's nominee for President in the 2000 U.S. presidential election. Gore is currently an author and environmental activist. He has founded a number of non-profit organizations, including the Alliance for Climate Protection, and has received a Nobel Peace Prize for his work in climate change activism.

In his senior year at Harvard University, he took a class with oceanographer and global warming theorist Roger Revelle, who sparked Gore's interest in global warming and other environmental issues. After joining the U.S. House of Representatives, Gore held the first congressional hearings on the climate change, and co-sponsor[ed] hearings on toxic waste and global warming. Gore was known as one of the Atari Democrats, later called the "Democrats' Greens: politicians who see issues like clean air, clean water and global warming as the key to future victories for their party.

Gore wrote the book An Inconvenient Truth: The Planetary Emergency of Global Warming and What We Can Do About It, which won a Grammy Award for Best Spoken Word Album in 2009. An Inconvenient Truth is a 2006 documentary film directed by Davis Guggenheim about Al Gore's campaign to educate citizens about global warming via a comprehensive slide show that, by his own estimate, Gore has given more than a thousand times. Our Choice is a 2009 book written by Gore, originally titled, which followed the An Inconvenient Truth... (book). All profits of the book (printed on 100% recycled paper) go to the Alliance for Climate Protection, which Gore founded in 2006.


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Global Vegetation.jpg
Credit: NASA image of the day gallery

Global vegetation – Food, fuel and shelter. Vegetation is one of the most important requirements for human populations around the world. Satellites monitor how "green" different parts of the planet are and how that greenness changes over time. These observations help scientists understand the influence of natural cycles, such as drought and pest outbreaks, on vegetation, as well as human influences, such as land-clearing and global warming.

In the news

From the Wikinews Climate change category
  • June 23: On the campaign trail in the USA, May 2016
  • May 31: Australian Opposition Leader pledges to save Great Barrier Reef
  • August 6: Australian–US team of scientists finds Atlantic warming causes Pacific climate trends
  • July 28: Scientists analyse effects of global warming, atmospheric ozone on crops
  • June 6: Queen's Speech sets out Coalition government's final year agenda
  • December 31: Expected U.S. Senate special election taking shape in Massachusetts
  • July 5: On the campaign trail, June 2012
  • April 15: Wikinews Shorts: April 14, 2012
  • March 30: Report indicates continued severe weather problems still looming
  • December 21: Wikinews interviews former Salt Lake City mayor and 2012 presidential candidate Rocky Anderson

Additional News
More Global warming news on Wikinews

Did you know

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. )

Other "Did you know" facts... Read more...

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