Scientists propose ingenious way but not yet proven to address climate change: the spraying & # 39; chemicals lowering sun in Earth's atmosphere.
CNN reports that research by scientists at the universities & # 39; Harvard and Yale, published in the journal Environmental Research Letters, proposes using techniques known as stratospheric aerosol injection, 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 not developed and no craft & # 39; existing air suitable for adaptation, the researchers say that "the development of & # 39; new tanker constructed with & # 39; use by & # 39 ; capabilities & # 39; substantial load technologically neither difficult nor expensive b & # 39; prohibitive way. "
They estimate the total cost of the launch of & # 39; hypothetical system within 15 years to about $ 3.5 billion, with recurring costs & # 39; $ 2.25 billion a year over & # 39; 15 years.
However, the report acknowledges that the technique is purely hypothetical.
"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."
The researchers also recognize potential risks: coordination between multiple countries in both hemispheres is required, and techniques & # 39; stratospheric injection of & # 39; aerosol can 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 conviction of the 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 more risky long a & # 39; time ", said Philippe Thalmann of Polytechnique Fédérale de Lausanne Ecole, the expert in the economics of climate change.
David Archer of the Department of Geophysical Sciences at the University & # 39; Chicago said, "The problem with climate & # 39; engineering b & # 39; this way is that only Banda Band covering temporary problem that will persist essentially forever, in fact hundreds & # 39; & # 39 thousands; years for fossil fuel CO2 to finally go b & # 39; natural way.
"It will be tempted to continue to hamper the cleaning system & # 39; our power, but we will depart from the planet on form & # 39; life support. If future generation failing to pay their climate bill, it will get its entire heating at & # 39; blow. "