File:Projected changes in yields of selected crops with global warming.png
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說明
說明
摘要
[編輯]描述Projected changes in yields of selected crops with global warming.png |
English: This bar graph shows projected changes in yields of selected crops with global warming. Projected changes are shown for 1-4 °C of global warming, relative to late 20th century. Changes in yield are shown for African maize, Asian rice, Indian wheat, US maize, and US soybean. Summary of changes:
Data Values are approximate and are taken from the US National Research Council (US NRC, 2011).[1] The first, second, third and fourth numbers are the projected changes in yields (%) for 1, 2, 3 and 4 °C of global warming, respectively.:
These data are also available as comma-separated values. US NRC (2011)[1] drew on several studies. The graph does not show the "likely" ranges included in US NRC (2011).[1] The likely range means that there is a 67% chance of the projected change in yield being correct, based on expert judgement.[1] For 1 °C of warming, the likely range is roughly equal to plus or minus (±) 5-10% for all projected changes in yields.
These projections broadly show the probable changes in regional yields.[2] The projections do not include measures to adapt to global warming.[2] Actual changes in yields may vary according to local conditions.[2] There are numerous other uncertainties, including how local climate will change with global warming, and the atmospheric concentration of carbon dioxide (CO2) associated with different magnitudes of global warming.[2] There is also the possibility that yields will change if critical thresholds are crossed.[2] Many of the uncertainties could bias the projections towards underestimating reductions in crop yields.[2] However, adaptation practices could help to reduce losses in yields.[2] Adaptation will be more difficult for higher magnitudes of warming, and may be less effective in tropical regions.[2] Notes
References
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日期 | |
來源 | 自己的作品 |
作者 | Enescot |
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Comma-separated values
[編輯]Data were exported from OpenOffice.org 3.4.1 Calc as comma-separated values (csv). The following options were used:
- Character set: Western Europe 1252
- Field delimiter: ,
- Text delimiter: "
- Quote all text cells: no
- Save cell content as shown: yes
- Fixed column width: no
,,,,,, ,,,Global warming relative to late 20th century,,, ,,1,2,3,4, ,Africa maize,-14,-25,-37,-46, ,Asia rice,3,1,-3.5,-7.5, ,India wheat,-5,-23,-47,-68,Change in yields (%) ,US maize,-13,-27,-44,-60, ,US soybean,6,0,-14,-30,
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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 2013年7月29日 (一) 11:48 | ![]() | 1,345 × 689(15 KB) | Enescot(留言 | 貢獻) | {{Information |Description ={{en|1=This bar graph shows projected changes in yields of selected crops with global warming. Projected changes are shown for 1-4 °C of global warming, ... |
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