Global threats to human water security and river biodiversity is the title of a new study that points out that almost 80% of the world’s population are exposed to some risk of insecure freshwater resources (published in Nature 467, 555-561 (30 September 2010) | doi:10.1038/nature09440). The researchers created a global raster plotting the security level of water resources based on an index of water threats which is discussed in their paper.
Much of the threats in wealthier countries can be counteracted with technology, which explains much less actual insecurity in these countries – but therefore puts biodiversity at risk and resulting in a high price for an inevitable resource of human life.
Talking to BBC News Peter McIntyre from the University of Wisconsin, one of the scientists involved in the study, puts it this way:
“But even in rich parts of the world, it’s not a sensible way to proceed. We could continue to build more dams and exploit deeper and deeper aquifers; but even if you can afford it, it’s not a cost-effective way of doing things.” (Source: BBC)
The unaltered stress level of global freshwater resources as published in the study is presented in this map (Source: Nature):
Accompanied by the map of biodiversity, this gives an interesting insight to the impacts on biodiversity. The impact on human population remains less shown in this depiction but is another crucial issue of the paper. As mentioned before, 80% of the world population are exposed to threatened water resources. By applying their map to the gridded-cartogram technique, the whole impact of these threatened water resources on the population becomes apparent. The 80% at risk become visible, as the map transformation preserves the geographical reference of the underlying grid. The emerging picture is going along quite well with the findings of the study and thus adds another interesting perspective on the issue of threatened water resources in the most populated regions in the world. All data from the study is available on http://www.riverthreat.net/data.html and we used that data to reproject the key maps of the study.
This map shows the “natural” picture of the human water security threat level from the study:
(click for larger version)
When taking the investments on water technology into account, this picture changes considerably, as the next map shows:
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This iconic composite image of the earth at night of NASA’s Defense Meteorological Satellites Program is the world as we imagine it when the earth is not facing the sun. But this image does not tell the full story of the night’s world, as it suggests that it shows where people are (because there is light). There are actually many people living with little light at night (and perhaps many others wish for some less light, but live in one of the bright spots of this image). Therefore, this image is some kind of fake thing when it comes to the real world at night. The real world at night for the world’s population looks more like the following map, which has been shown on this website before (see here). The reason for showing it again is not only that it has become the header-image of this website, but because the theatre performance What I heard about the World recently incorporated this map in the show’s announcements:
(click for large image)
