Image:IPCC Radiative Forcings.png

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[edit] Summary

Changes in radiative forcings between 1750 and 2000 based on IPCC estimates. Found at [1]

Understanding global warming requires understanding the changes in climate forcings that have occurred since the industrial revolution. These include positive forcing from increased greenhouse gases negative forcing from increased sulphate aerosols and poorly constrained forcings from indirect areosol feedbacks as well as minor contributions from solar variability and other factors. The poorly constrained aerosol effects results from both limited physical undersanding of how aerosols interact with the atmosphere and limited knowledge of aerosol concentrations during the pre-industrial period. This is a significant source of uncertainty in comparing modern climate forcings to past states.

Contrary to the impression given by this figure, it is not possible to simply sum the radiative forcing contributions from all sources and obtain a total forcing. This is because different forcing terms can interact to either amplify or interfere with each other. For example, in the case of greenhouse gases, two different gases may share the same absorption bands thus partially limiting their effectiveness when taken in combination.

[edit] Fair use rationale

This figure is one of the more well-known IPCC images from the Third Assessment Report

It is used here to efficiently summarize the scientific understanding of radiative forcings.

It is believed that the educational use of this small portion of the non-profit IPCC reports is consistent with United States fair use doctrines.

This work is copyrighted and unlicensed. It does not fall into one of the blanket fair use categories listed at Wikipedia:Fair use#Images or Wikipedia:Fair use#Audio_clips. However, it is believed that the use of this work in the article "radiative forcing":

To illustrate the object in question
Where no free equivalent is available or could be created that would adequately give the same information
On the English-language Wikipedia ([2]), hosted on servers in the United States by the non-profit Wikimedia Foundation ([3]),

qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Fair use and Wikipedia:Copyrights.

To the uploader: this tag is not a sufficient claim of fair use. You must also include the source of the work, all available copyright information, and a detailed fair use rationale.

[edit] Licensing

To illustrate the object in question
Where no free equivalent is available or could be created that would adequately give the same information
On the English-language Wikipedia ([4]), hosted on servers in the United States by the non-profit Wikimedia Foundation ([5]),

To the uploader: this tag is not a sufficient claim of fair use. You must also include the source of the work, all available copyright information, and a detailed fair use rationale.

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(del) (cur) 00:29, 21 June 2006 . . Keenan Pepper (Talk | contribs) . . 600×443 (24,436 bytes) (==Summary== Changes in radiative forcings between 1750 and 2000 based on IPCC estimates. Found at [http://www.grida.no/climate/ipcc_tar/wg1/figspm-3.htm] Understanding global warming requires understanding the changes in climate forc)