A technique known as a stratospheric aerosol injection (SAI) could reduce the rate of global warming by half, says research by scientists at Harvard and Yale universities. His idea would involve spraying large amounts of sulphate particles into the Earth's lower stratosphere at an altitude of 20 kilometers.
Scientists say they will disperse the sulphates using balloons or planes designed to reach high altitudes, or large maritime naval verses. However, they allowed themselves to know that the technique is, up to now, purely hypothetical. There is no appropriate technology or aircraft to perform this experiment, but the team says the system can be created within 15 years.
The cost of starting the UPS is estimated at $ 3.5 billion (USD) with operating costs of $ 2.25 billion a year.
The report acknowledges that it is a hypothetical deployment, but that its creation is possible.
We do not make judgments about the suitability of the UPS. We simply show that the hypothetical deployment program starting at age 15, though very uncertain and ambitious, would actually be technically possible from an engineering perspective. It would also be very cheap.
The team admits there will be extreme risk with the system, as it would be necessary to coordinate between multiple countries in both hemispheres. In addition, they say SAI techniques can endanger agriculture, cause droughts, or cause extreme weather.
Dr. Gargoyle Wagner of the Harvard Graduate School of Engineering and co-author of the study said:
Given the potential benefits of halving projected increases in radiological coercion from a given date, these figures refer to the incredible solar geoengineering economy. Dozens of countries could finance such a program, and the technology needed is not particularly exotic.
The proposals also do not address the issue of increased greenhouse gas emissions, which are one of the main reasons for global warming.
Philip Thalmann, from École Polytechnique Fédérale de Lausanne, an expert on climate change economics, said the system would be very expensive and much more risky in the long run.
David Archer, from the Department of Geophysical Sciences at the University of Chicago, said:
The problem with the engineering climate in this way is that it is only temporary assistance to bands that cover a problem that will remain essentially forever. It will be tempting to continue to delay the purity of our energy system, but we will leave the planet in the form of life support. If the next generation does not pay the climate change bill, they will receive all our heating at once.
The project is not approved by a government or authority, and further research will be required to verify its validity.
The results of the research were published in the scientific journal Environmental Research Letters.