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Tag: Vegetation

Zambezi River Basin vegetation
Land cover and land use have great impacts on water resources, as they affect how precipitation translates into runoff, infiltration, evaporation, and the quality of the water (Hirji et al. 2002). Almost 75 per cent of ...
14 Oct 2013 - by 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 clima...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Increases in annual temperatures for a recent five-year period, relative to 1951-1980
Warming is widespread, generally greater over land than over oceans, and the largest gains in temperatures for the planet are over the North American Arctic, north central Siberia, and on the Antarctic Peninsula. These r...
18 Apr 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Money grows on trees - direct values from community management in Tanzania
In an effort to bring back life to the degraded and over-used lands of the poor Shinyanga region of Tanzania, the government has brought back the traditional practice of Ngitili. Vegetation and trees are nurtured in encl...
20 Sep 2005 - by Hugo Ahlenius, UNEP/GRID-Arendal
Tropical hydropower dams as greenhouse sources
Large tropical hydropower reservoirs in Latin America may have a potential adverse impact on the climatic system through releasing greenhouse gases into the atmosphere. Submerging large areas of land and tropical vegetat...
17 May 2005 - by Viktor Novikov, UNEP/GRID-Arendal
Impact of Climate Change on Mountain Vegetation Zones
No data
20 Jun 2009 - by Philippe Rekacewicz assisted by Cecile Marin, Agnes Stienne, Guilio Frigieri, Riccardo Pravettoni, Laura Margueritte and Marion Lecoquierre.
The Carbon Cycle
Carbon stocks in forest areas comprise carbon in living and dead organic matter both above and below ground including trees, the understorey, dead wood, litter and soil. On a global scale, vegetation and soils are e...
20 Jun 2009 - by Philippe Rekacewicz assisted by Cecile Marin, Agnes Stienne, Guilio Frigieri, Riccardo Pravettoni, Laura Margueritte and Marion Lecoquierre.
Estimate of Area of Vegetation Destroyed Annually by Fire by Region
No data
20 Jun 2009 - by Philippe Rekacewicz assisted by Cecile Marin, Agnes Stienne, Guilio Frigieri, Riccardo Pravettoni, Laura Margueritte and Marion Lecoquierre.
Ore production and waste generation at Ok Tedi Mine
The Ok Tedi mine is located high in the rain forest covered Star Mountains of Papua New Guinea. Prior to 1981 the local Wopkaimin people lived a subsistence existence in one of the most isolated places on earth. That was...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
From wetlands to dry lands: the destruction of the Mesopotamian marshlands
The Mesopotamian marshlands in the Tigris and Euphrates river basins were devastated by damming and river channelisation during the late 1980s. This graphic illustrates the decline in the area's marshlands by comparing t...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Lake Chad - decrease in area 1963, 1973, 1987, 1997 and 2001
Straddling the borders of Nigeria, Chad, Niger and Cameroon in West Africa, Lake Chad has been a source of freshwater for irrigation projects in all these countries. This graphic traces the shrinkage of Lake Chad and cha...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
National level of protection of major Arctic vegetation zones
The Arctic region has varying levels of protected areas that correspond to different vegetation zones. This is from a report by Conservation of Arctic Flora and Fauna (CAFF), Habitat Conservation Report No. 2.
13 Feb 2006 - by UNEP/GRID-Arendal
Arctic vegetation zones
Distribution of major vegetation zones and level of protection in the Arctic is shown based on the percentage of area covered. This is part of a report by the Conservation of Arctic Flora and Fauna (CAFF).
13 Feb 2006 - by UNEP/GRID-Arendal
Climate change impact on mountain vegetation zones
The figure shows a comparison of current vegetation zones at a hypothetical dry temperate mountain site with simulated vegetation zones under a climate-warming scenario. Mountains cover about 20% of the Earth's continent...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Carbon cycle
Carbon is the basis of all organic substances, from fossil fuels to human cells. On Earth, carbon is continually on the move – cycling through living things, the land, ocean, atmosphere. What happens when humans start dr...
17 May 2005 - by UNEP/GRID-Arendal
Impact of human activities on reindeer habitat - Barents region
The impact of infrastructure development on reindeer potentially threatens the cultural traditions of the Barents region indigenous people and their chosen way of life. The probability of impact on wildlife, vegetation a...
26 Jan 2006 - by Philippe Rekacewicz, Julien Rouaud, UNEP/GRID-Arendal
The Cryosphere, world map
Snow and the various forms of ice - the cryosphere - play different roles within the climate system. The two continental ice sheets of Antarctica and Greenland actively influence the global climate over time scales of mi...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Increases in annual temperatures for a recent five-year period, relative to 1951-1980
Warming is widespread, generally greater over land than over oceans, and the largest gains in temperatures for the planet are over the North American Arctic, north central Siberia, and on the Antarctic Peninsula. These r...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
People affected by natural disasters in Africa from 1971 to 2001
Poor people all over Africa are vulnerable to droughts and floods since many depend on rainfed agriculture as their main means of subsistence and often live in degraded areas susceptible to rainfall variation (cleared of...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Reforestation, town of Galma and surroundings, Niger 1975 and 2003
In 1970s and 1980s - years of environmental crisis, there were few trees remaining in Niger. Wind-blown sands razed farmers' young crops and they often had to plant crops three times to succeed. Since the middle of the 1...
01 Oct 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
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