Sunday , November 29 2020

Cheap sun barrier could cut global warming



London: Spraying sun-shading chemicals high above Earth to slow global warming could be "remarkably cheap", costing about $ 3.1 billion a year over a 15-year period, according to a study by US scientists.

A new way to slow climate change? Block the sun.

A new way to slow climate change? Block the sun.

Some researchers say the geo-engineering technique known as stratospheric aerosol injection (SAI) could limit rising temperatures that are causing climate change.

As yet unproven and hypothetical, it would involve the use of large hoses, cannons or specially designed aircraft to spray large amounts of sulphate particles into the upper layer of the atmosphere to act as a reflective barrier against sunlight.

Total cost to launch a hypothetical SAI effort 15 years from now would be $ A4.8 billion, scientists at Harvard University said in a report published in the journal Environmental Research Letters, adding that average annual operating costs would be about $ 3.1 billion a year over 15 years.


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