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Saturday, July 19, 2003
The state of fresh water in the world
 The Economist has a reasonably good survey of the state of fresh water supply in the world. Most of the articles are not available for free online, but the paper copy of the Economist has them all.
Not surprisingly, most of the ideas on how to solve the current problems are centred around management and water pricing, these are not bad ideas, but should be combined with new methods. The general gist of the articles is that there is enough water it just needs to be managed properly. Thursday, July 10, 2003
New desalination technique
 AquaSonics have a process which they claim will turn seawater into fresh water at around a third of the cost of conventional desalination. The new method is called rapid spray evaporation and have been produced to work with portable units so far. The system can desalinate water which is considerably saltier than sea water (up to five times higher salt content) and is much more effficent than reverse osmosis for example.
1990s the warmest decade for 2000 years
 In a future issue of Geophysical Research Letters Michael Mann of University of Virginia report on temperature records from 13 regions in the world that cover two millennia. The records show that the 1990s appear to be the warmest decade in the norther hemisphere, and it strongly suggest that the same applies for the sourthern hemisphere. Mann and other leading British and American palaeoclimatologists conclusion is that the warming in the late 20th century has been worldwide. Mann says: "It becomes increasingly less plausible that natural variability can explain the late-20th-century warming". |
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