(CNN) – Scientists are proposing ingenious way but not yet proven to address climate change: the spraying & # 39; chemicals that lower the eyes in the Earth's atmosphere.
Research by scientists at the universities & # 39; Harvard and Yale, published in the journal Environmental Research Letters, proposes to use known as stratospheric aerosol injection technique (AIS), to say that you & # 39; reduce global warming in & # 39; half.
The technique involves the spray & # 39; large amounts of & # 39; sulphate particles in the lower stratosphere in the World & # 39; altitude as 12 miles. Scientists propose to deliver sulphates b & # 39; & # 39 aircraft, designed in high altitude & # 39; special way, balloons or guns & # 39; large naval style.
Although the technology is still developing and no existing aircraft actually suitable for adaptation, say researchers' development & # 39; new tanker constructed with & # 39; use by & # 39; substantial capabilities & # 39; load & # 39; load neither technologically difficult or expensive b & # 39; prohibitive way. "
They estimate the total cost of the launch of & # 39; of & # 39 system; hypothetical SAI within 15 years at & # 39; about $ 3.5 billion, with running costs & # 39; $ 2.25 billion a year over & # 39; 15 years.
The report, however, acknowledges that the technique is purely hypothetical now.
"We do not do any about SAI desire judgment," says the report. "We just show that program & # 39; hypothetical exercise starting from 15 years hence, while both uncertain and very ambitious, very technically possible from the engineering point of view. It is also very cheap."
Recognizing also the potential risks – is necessary coordination between various countries in both hemispheres, and the SAI techniques could jeopardize the harvesting of crops, causing lead to drought or extreme weather.
The proposals also address the issue of & # 39; gas emissions by & # 39; effect & # 39; increasing emissions, which are a major cause of global warming.
And despite the condemnation of the leading authors of the report, other experts were skeptical.
"From the perspective of climate economics, management of solar radiation is still much harsher solution emissions gas emissions & # 39; effect & # 39; greenhouse: more expensive and much riskier long a & # 39; time. " Philippe Thalmann from the École Polytechnique Fédérale de Lausanne, an expert in the economics of climate change, told CNN.