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Natural ecosystem conversion Natural ecosystem conversion
It is clear that much land needs to be kept for agricultural use but it is also possible that the area required for food production will stabilize in the future.
03 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Human use and conversion of tropical forests Human use and conversion of tropical forests
Tropical forests hold the largest terrestrial carbon store and are active carbon sinks. Reducing emissions from deforestation and degradation is a vital component of tackling dangerous climate change. In addition, tackling illegal and ill-managed logging will be an important part of reducing emissions from forestry.
27 May 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Maps of average sea ice extent in the Arctic summer (September) and winter (March), and in the Antarctic summer (February) and winter (September) Maps of average sea ice extent in the Arctic summer (September) and winter (March), and in the Antarctic summer (February) and winter (September)
Passive microwave sensors on satellites have monitored the extent of the sea ice cover since 19782. This technique is widely used to investigate fluctuations in ice extent over the seasons, variability between years, and longterm trends. The seasonal variation of ice extent is much greater in the Antarctic where there is about six times as much ice in winter as in summer. Currently, in the Arctic, ice approximately doubles from summer to winter. ...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Estimates of people flooded in coastal areas in the 2080s as a result of sea-level rise and for given socio-economic scenarios and protection responses Estimates of people flooded in coastal areas in the 2080s as a result of sea-level rise and for given socio-economic scenarios and protection responses
The lines represent IPCC Special Report on Emissions Scenarios (SRES) based on different world views. The differences in impacts between the SRES scenarios for the same amount of sea-level rise and protection response reflect differences in exposure (population) and ability to adapt (wealth). The solid lines represent a level of 'constant' (no additional) protection response. The dashed and dotted lines represent the addition of protection respon...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Climate feedbacks - the connectivity of the positive ice/snow albedo feedback, terrestrial snow and vegetation feedbacks and the negative cloud/radiation feedback Climate feedbacks - the connectivity of the positive ice/snow albedo feedback, terrestrial snow and vegetation feedbacks and the negative cloud/radiation feedback
Feedback refers to the modification of a process by changes resulting from the process itself. Positive feedbacks accelerate the process, while negative feedbacks slow it down. Part of the uncertainty around future climates relates to important feedbacks between different parts of the climate system: air temperatures, ice and snow albedo (reflection of the sun’s rays), and clouds. An important positive feedback is the ice and snow albedo feedback...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Ratio of wastewater treatment Ratio of wastewater treatment
The ratio of treated to untreated wastewater reaching water bodies for 10 regions. An estimated 90 per cent of all wastewa- ter in developing countries is discharged untreated directly into rivers, lakes or the oceans (UN Water, 2008).
01 Mar 2010 - by UNEP/GRID-Arendal, Hugo Ahlenius
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Keylinks Keylinks
04 Oct 2007 - by
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Radiation from Chernobyl Radiation from Chernobyl
What do the Chernobyl disaster, the Three Gorges dam in China and the spread of the Sahel have in common? In each case natural and manmade influences have forced thousands, sometimes millions of people, to leave their land or country of origin.
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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Sanitation Opyions Sanitation Opyions
About sanitationoptions [converted]
04 Oct 2007 - by
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Mauritania Mauritania
04 Oct 2007 - by
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p04-05-statlog-onecol p04-05-statlog-onecol
About p04-05-statlog-onecol
13 Feb 2007 - by
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p04-05-aids p04-05-aids
About p04-05-aids
13 Feb 2007 - by
3
brasiliwater brasiliwater
About brasiliwater
13 Feb 2007 - by
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p14-15-brazil p14-15-brazil
About p14-15-brazil
13 Feb 2007 - by
3
p06-07-water-gulf p06-07-water-gulf
About p06-07-water-gulf
13 Feb 2007 - by
3
p00-01-hazards p00-01-hazards
About p00-01-hazards
13 Feb 2007 - by
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