Proposta da Geoengenharia
- satir15
- Dec 14, 2014
- 2 min read
Este documento foi elaborado por vários cientistas, dentre eles o David Keith, que propõe a utilização do controle climático pela geoengenharia.
Geoengineering methods can usefully be divided into two basic ‘classes’:
1) Carbon dioxide removal (CDR) techniques which remove CO2 from the atmosphere;
2) Solar Radiation Management (SRM) techniques that refl ect a small percentage of the sun’s light and heat back into space.
Background
Climate change is happening. Its impacts and costs will be large, serious, and unevenly spread. The impacts may be reduced by adaptation, and moderated by mitigation, especially by reducing emissions of greenhouse gases.
However, global efforts to reduce emissions have not yet been suffi ciently successful to provide confidence that the reductions needed to avoid dangerous climate change will be achieved. It is hoped that post-2012 emission reduction targets will stimulate greater action through more effective
mechanisms, but there is a serious risk that sufficient mitigation actions will not be introduced in time, despite the fact that the technologies required are both available and affordable.
It is likely that global warming will exceed 2°C this century unless global greenhouse gas emissions are cut by at least 50% of 1990 levels by 2050, and by more thereafter. There is no credible emissions scenario under which global mean temperature would peak and then start to decline by 2100. Unless future efforts to reduce greenhouse gas emissions are much more successful then they have been so far, additional action may be required should it become necessary to cool the Earth this century. Such action might involve geoengineering, defined as the deliberate large-scale intervention in the Earth’s climate system, in order to moderate global warming.
CONTUDO: muitos especialistas já não apoiam a idéia de aquecimento global, nem de efeito estufa. veja a materia sobre o Dr. Lovelock que foi um grande entusiasta dessas ideias no inicio.
The most promising SRM methods are (in order of priority):
1. Stratospheric aerosol methods. These have the most potential because they should be capable of producing large and rapid global temperature reductions, because their effects would be more uniformly distributed than for most other methods, and they could be readily implemented. However, potentially there are significant side-effects and risks associated with these methods
that would require detailed investigation before largescale experiments are undertaken.
2. Cloud brightening methods. Although these are likely to be less effective and would produce primarily localised temperature reductions, they may prove to be readily implementable, and should be testable at small scale with fewer governance issues than other SRM methods.
3. Space based SRM methods. Space methods would provide a more uniform cooling effect than surface or cloud based methods, and if long-term geoengineering is required, may be a more cost-effective option than the other SRM methods although development of the necessary technology is likely to take decades.
o documento na integra pode ser obtido aqui:
https://royalsociety.org/~/media/Royal_Society_Content/policy/publications/2009/8693.pdf ou
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