HomeAboutActivitiesMapsPhotosPublicationsNews
 
Home >> Geology

Tag: Geology

Historical trends in carbon dioxide concentrations and temperature, on a geological and recent time scale Historical trends in carbon dioxide concentrations and temperature, on a geological and recent time scale
The most recent geological history, in the last hundred thousand years, has been characterised by cycles of glaciations, or ice ages. The historic temperatures, through these times, have been low, and continental ice sheets have covered large parts of the world. Through ancient air, trapped in tiny bubbles in the Antarctic ice, we have been able to see what the temperature cycle was at that time, and also the concentration of carbon dioxide (CO2)...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
4
Different sources of danger and their impacts to the environment Different sources of danger and their impacts to the environment
Contaminated groundwater can adversely affect animals, plants and humans if it is removed from the ground by manmade or natural processes. Depending on the geology of the area, groundwater may rise to the surface through springs or seeps, fl ow laterally into nearby rivers, streams, or ponds, or sink deeper into the earth. In many parts of the world, groundwater is pumped out of the ground to be used for drinking, bathing, other household uses, a...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
5
Deep waters within and beyond areas of national jurisdiction in East Africa Deep waters within and beyond areas of national jurisdiction in East Africa
The figure demonstrates that the overwhelming majority of marine areas under national jurisdiction in East Africa are deeper than 200 metres (dark blue). Areas in red indicate where the geology/geomorphology might justify (subject to further research and interpretation) a submission/claim to be made by coastal states individually or jointly to increase their national seabed and subsoil areas, which, in turn, may be of major economic potential.
01 Feb 2008 - by UNEP-WCMC and UNEP/GRID-Arendal
3
Alkalinity in major rivers Alkalinity in major rivers
This graphic shows the average bicarbonate concentrations, in milligrams per litre, at major river mouths for the time periods 1976 to 1990 and 1991 to 2000. The graphic also shows the changes in average bicarbonate levels between these two time periods. Bicarbonate is an indication of the alkalinity in the rivers which reflects the geology (rock, minerals, sand) and increases the buffering capacity, but can also increase the risk of eutrophicati...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
3
Historical trends in carbon dioxide concentrations and temperature Historical trends in carbon dioxide concentrations and temperature
The more recent history, from the middle ages and up until now, show increasing temperatures, rising as the world emerged from the Little Ice Age (LIA), around 1850. With the industrial era, human activities have at the same time increased the level of carbon dioxide (CO2) in the atmosphere, primarily through the burning of fossil fuels. Carbon dioxide is one of the main greenhouse gases, and scientists have been able to connect human activities ...
31 Jul 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
3
Role of geology in Article 76 Role of geology in Article 76
No data
03 Feb 2010 - by Riccardo Pravettoni, UNEP/GRID-Arendal
3