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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

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

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

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

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

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

env_goodsservices

About env_goodsservices

29 Nov 2007 - by

keylinks

About keylinks

29 Nov 2007 - by

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