Wastewater treatment in the Mediterranean coastal cities
The distribution of coastal cities that either lack wastewater
treatment facilities or have inadequate treatment facilities (defined as those removing less than 70 to 90 % of the Bio-chemical Oxygen Demand (BOD)) can be used as a proxy to identify areas where potentially deleterious amounts of organic matter are being added to the marine environment. Effective removal of pollutants from wastewater is achieved through secondary treatment that rem...
19 Nov 2013 - by GRID-Arendal
Ratio of wastewater treatment
Sewage treatment is low or absent in many parts of the World, leading to eutrophication of the coastal zone, (toxic) algae blooms and dramatically reduce the ability of coral to recover from bleaching events dramatically. The data reflects the bodies of the UNEP Regional Seas programme.
01 Nov 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Overview of renewable energy sources
This chart shows eight different sources of renewable energy and explains advantages and drawbacks of each - wind, sun (photovoltaic and thermal), geothermal, wood, ocean, waste, water (hydroelectricity).
17 May 2005 - by UNEP/GRID-Arendal
Wastewater - Contaminants and their effects
The contaminants in waste- water come from many different sources and can have cumulative and synergistic effects requiring a multi-pronged response.
01 Mar 2010 - by UNEP/GRID-Arendal
Marginal abatement cost curve for Mexico in 2020
Estimating mitigation costs is a complex task that incorporates a high degree of uncertainty due to the variety of factors involved. However, this exercise provides valuable information to design mitigation strategies. Estimates for Mexico show the substantial economic benefits to be gained from a strategy that considers the transport sector, coupled with the amount of emissions could be reduced. It also highlights the lower costs associated to m...
22 Nov 2010 - by Nieves López Izquierdo (Associate Consultant UNEP/GRID-Arendal)