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Tag: Trend

Overview on glacier changes since the end of the Little Ice Age
Glaciers and ice caps reached their Holocene (the past 10 000 years) maximum extent in most mountain ranges throughout the world towards the end of the Little Ice Age, between the 17th and mid-19th century. Over the past...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Variations in snow depth and ice cover, alpine lake at Hardangervidda plateau, Norway
Climate warming means that lowland lakes typically are experiencing longer ice-free periods, promoting greater biological productivity. However, despite this warming trend, biological productivity may be reduced, at leas...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Trends in snow-covered area for the Northern Hemisphere 1922-2005
Observations of snow-covered area for the Northern Hemisphere show a significant development in the later 20th century, with a reduction of the area covered by snow in the spring (March-April) from some 38 million km2 in...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Regional changes in Arctic and Antarctic sea ice
There are major regional differences for the Arctic sea ice, with the strongest decline in ice extent observed for the Greenland Sea (10.6 per cent per decade). The smallest decreases of annual mean sea ice extent were f...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Main direct drivers of change in biodiversity and ecosystems (CWG)
The cell color indicates impact of each driver on biodiversity in each type of ecosystem over the past 50–100 years. High impact means that over the last century the particular driver has significantly altered biodiversi...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Market access (estimated travel time) in agricultural areas
Accessibility to food is also determined by the long-term trend in food prices (which is a different issue from price volatility). The rising trend in global food prices is likely to persist in the next decade. In the...
02 Feb 2009 - by Hugo Ahlenius, UNEP/GRID-Arendal
Centralized or decentralized? - Uganda. A study case
Looking at the costs and benefits, centralized systems may not be the answer in terms of best result for the investment. The chart on the left shows that the financial NPV does not change with increasing population size ...
01 Mar 2010 - by UNEP/GRID-Arendal
Wild rangifer population trends
Wild reindeer and caribou, Rangifer tarandus, are widely distributed around the circumpolar Arctic where they play a key role in the environment, culture, and economy of the region. One of the two major wild reindeer po...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Trends in Arctic shorebird populations
Shorebirds are the most diverse group of Arctic breeding birds and one of the most abundant. From the Arctic, they migrate to their non-breeding grounds along well-defined flyways that circle the world. As a group, howe...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution and current trend of polar bear subpopulations throughout the circumpolar Arctic
Polar bears occur in 19 relatively discrete subpopulations with an estimated worldwide abundance of 20,000– 25,000 animals. Our knowledge of the status and trend of each subpopulation varies due to availability, reliabil...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Location of datasets in the Arctic Species Trend Index (ASTI)
Dramatic changes, such as sea ice loss, are projected to occur in Arctic ecosystems over the next century. Understanding how the Arctic’s living resources, including its vertebrate species, are responding to these change...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic terrestrial species trends 1970-2005 (ASTI)
Dramatic changes, such as sea ice loss, are projected to occur in Arctic ecosystems over the next century. Understanding how the Arctic’s living resources, including its vertebrate species, are responding to these change...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution and current trend of polar bear subpopulations throughout the circumpolar Arctic
Polar bears occur in 19 relatively discrete subpopulations with an estimated worldwide abundance of 20,000– 25,000 animals. Our knowledge of the status and trend of each subpopulation varies due to availability, reliabil...
01 May 2010 - by Hugo Ahlenius, UNEP/GRID-Arendal
Rapid decline of the San Quintin glacier, Northern Patagonia
Glaciers grow and retreat at intervals depending on changes in local climate, and local variations in temperature and precipitation play a particularly important role in this. Retreating and diminishing mountain glaciers...
22 Nov 2010 - by Viktor Novikov, Zoï Environment
Climate impacts and tropical diseases in Colombia
Shows comparative trend between air temperature in Colombia and levels of malaria and dengue fever. When temperatures increase, especially in combination with more precipitation, vector borne diseases like malaria and d...
17 May 2005 - by UNEP/GRID-Arendal
Trends in regional average surface temperatures
Latin America and the Caribbean follows the global trend of recent increases in temperatures. Observational records show that the region, with a few variations, has been warming through the 20th century. As in the rest ...
17 May 2005 - by UNEP/GRID-Arendal
History of variations of the temperature for Africa in relation to the World
Africa is following the global trend of recent increases in temperatures. This resource includes three graphics. The first shows the main temperature anomaly in degrees Celsius in Africa from 1900 to 2000. The second sho...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Lake Chad: almost gone
Straddling the borders of Chad, Niger and Cameroon in West Africa, Lake Chad has been a source of freshwater for irrigation projects in each of these countries. Maps drawn from a series of satellite images show a dramati...
06 Nov 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
Historical population trend, Grahamstown 1840-1980
While the white population were the majority in the early period of Grahamstown, South Africa, they were outnumbered around 1920. Historically, the non-white population did not pay for water and sanitation services, and ...
18 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Gender division of labour in agriculture and household activities - Nepal and India
In Nepal, the gender division of labour is highly skewed, especially when agricultural, pastoral and wage labour is combined with household, community and casual labour, and when high rates of men’s out-migration to ur...
05 Dec 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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