Solar Radiation Management (GeoEngineering)
Solar radiation management (SRM) projects are a type of geoengineering which seek to reduce the amount of sunlight hitting the Earth and thus counteract global warming. The phenomenon of global dimming as a side-effect of fossil fuel use is widely known, and is not necessarily a geoengineering technique, as it occurs in normal conditions, due to aerosols caused by pollution, or caused naturally as a result of volcanoes and major forest fires. However, its deliberate manipulation is a tool of the geoengineer.
Solar radiation management projects do not reduce greenhouse gas concentrations in the atmosphere, and thus do not address problems such as ocean acidification caused by these gases. Their principle advantage as an approach to geoengineering is the speed with which they can be deployed and become fully active. By comparison, other geoengineering techniques based on greenhouse gas remediation, such as ocean iron fertilization, need to sequester the carbon excess before they can arrest global warming. Solar radiation management projects can therefore be used as a geoengineering 'quick fix' while levels of greenhouse gases can be brought under control by greenhouse gas remediation techniques.
By intentionally changing the Earth's albedo, or reflectivity, we could reflect more heat back out into space, or intercept sunlight before it reaches the Earth through a literal shade built in space. Examples of proposed solar radiation management techniques include the production of stratospheric sulfur aerosols, space mirrors, and cloud reflectivity enhancement. Most techniques have at least some side effects.
Various small-scale experiments have been carried out on techniques such as cloud seeding, increasing the volume of stratospheric sulfur aerosols and implementing cool roof technology. However, the applicability of many techniques has not been comprehensively tested. Even if the effects of small-scale interventions are known, there may be cumulative problems such as ozone depletion, which only become apparent from large scale experiments.
As well as the imperfect cancellation of the effect of greenhouse gases on global warming, there are other significant problems with solar radiation management as a form of geoengineering, not least of these are effects on the global hydrological cycle. Some like the burning of sulfur in the stratosphere would in fact increase the environmental problem of acid rain, while increased dust or soot particles may cause increased health concerns. Many would have interactions with global warming that would be complex and that may change with changing conditions.
Particular to solar radiation management, a risk of abrupt cessation exists. If SRM were to abruptly stop, the climate would rapidly warm. This would cause a sudden rise in global temperatures towards levels which would have existed without the use of the geoengineering technique. The rapid rise in temperature may lead to more severe consequences than a gradual rise of the same magnitude.
A number of geoengineering solutions have been suggested. Most of these suggestions could not counter current global warming but could make a minor contribution to it.http://www.climatechangesask.com/html/l ... /index.cfm
So now they are openly admitting to seeding our atmosphere with chemicals, under the disguise of helping us.
If that was the case why all the secrecy?