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The global climate is universally accepted to be a non-linear, dynamic (chaotic) system. It is,[url=http://www.c0achoutletusa2.com]http://www.c0achoutletusa2.com[/url], for example,[url=http://www.cloutletcheapshoes.com]cheap christian louboutin[/url], impossible to make reliable weather forecasts more than a few days ahead,[url=http://www.cheapgucchandbagsoutletus.com]gucci handbags[/url]. Despite this,  interventions are being proposed as a means of modifying the climate to arrest current global warming and initiate global cooling (, 10 September).
Since a geoengineering intervention can only be tested meaningfully at large scale, any such experiment would have to be agreed between all neighbouring states. The test would then either be ineffective,[url=http://www.cheapgucchandbagsoutletus.com]cheap gucci bags[/url], or achieve some uncontrollable measure of success within an imprecisely defined region for an unpredictable time, or initiate an irreversible change in climate over a region of unknown extent, also for an indeterminate period of time.
Geoengineering is, unfortunately, a totally impractical concept that could be used politically as an excuse for delaying further the drastic measures needed to reduce our consumption of irreplaceable natural resources,[url=http://www.lvhandbasoutletcheap.com]cheap louis vuitton[/url].
Roy Butterfield 
Emeritus professor of civil engineering,[url=http://www.polouscheaps.com]ralph lauren outlet online[/url], University of Southampton
??The only chance of avoiding catastrophic global warming lies in geoengineering. However,[url=http://www.ralphlaurencheapus.com]polo ralph lauren outlet[/url], the techniques mentioned would not address the increasing acidity of the seas. A complete solution to the problem is to remove carbon dioxide from the atmosphere,[url=http://www.cheapminibootssonsaleuk2.co.uk]http://www.cheapminibootssonsaleuk2.co.uk[/url]. It would be a challenge to remove it faster than the human race is currently releasing it but, with sufficient investment, it should be possible,[url=http://www.polouscheaps.com]polo ralph lauren[/url].
Carbon capture from power station chimneys and storage beneath the North Sea seems overly complicated; why not just capture it from the air above the North Sea using wind-powered equipment and pump it straight down there? A Manhattan Project to develop the technology should be launched.
Alan Naismith 
Lichfield, Staffordshire
    
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