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A study proposed a new way to combat climate change, by spraying chemicals to reduce sunlight in the Earth's atmosphere.
A technique known as stratospheric aerosol injection (SAI), its acronym in English, could halve the rate of global warming, according to a study by university scientists Harvard and Yale. His idea would involve spraying large quantities of sulphate particles in the lower stratosphere up to 20 km altitude.
Scientists say they would spray sulphates with the help of balloons or planes designed to reach high altitudes, or large naval style cannons. . However, they let it be known that the technique is, so far, purely hypothetical. There is no technology or adequate aircraft to carry out this experiment, but the team said the system could be created in the next 15 years.
The cost of launching the UPS system is estimated at $ 3.5 billion (USD). with operating costs of 2.25 billion USD per year
The report admits that it is a hypothetical deployment, but that its creation is possible
We make no judgment about the adequacy of the UPS. We simply show that a hypothetical deployment program starting at the age of 15, although highly uncertain and ambitious, would in fact be technically feasible from an engineering point of view. It would also be very cheap.
The team recognizes that there would be an extreme risk with the system, as coordination between several countries in both hemispheres would be necessary. In addition, they argue that SAI techniques could endanger agriculture, cause drought or extreme weather conditions.
million. Gergot Wagner, Harvard University School of Engineering, and co-author of the study, said:
Considering the potential benefits of halving the projected radiative forcing increases from the previous study. on a given date, these figures invoke the incredible economy of solar geoengineering. Dozens of countries could fund such a program and the technology required is not particularly exotic.
The proposals also do not address the issue of increasing greenhouse gas emissions, which are one of the main causes of global warming. 19659003] The votes against
Philippe Thalmann, of the Ecole Polytechnique Fédérale de Lausanne, expert in climate change economics, said the system would be very expensive and much riskier in the long run . [19659003] David Archer, Department of Geophysical Sciences, University of Chicago, said:
The problem of the technical climate in this way is that it is only d & # 39; a temporary dressing covering a problem that will persist forever. It would be tempting to continue to postpone the cleanliness of our energy system, but we would leave the planet as a support for life. If a future generation did not pay its climate bill, it would have all our heat at the same time.
The project has not been approved by any government or authority, and additional studies would be required to verify its validity.
The research was published in the scientific journal Environmental Research Letters.
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