Saturday , October 23 2021

Barriers to cheap sunlight can cut global warming


London: Spraying solar dimming high above Earth to slow global warming can be "very cheap", costing around $ 3.1 billion a year over a 15-year period, according to a study by US scientists.

New ways to slow down climate change? Block the sun.

New ways to slow down climate change? Block the sun.

Some researchers say the geo-engineering technique known as stratospheric aerosol injection (SAI) can limit the temperature rise that causes climate change.

Unproven and hypothetical, this would involve the use of large hoses, cannons or aircraft specifically designed to spray large amounts of sulfuric particles into the upper atmosphere to act as a reflective barrier to sunlight.

The total cost of launching a 15-year hypothetical SAI effort from now will be $ A4.8 billion, scientists at Harvard University said in a report published in the journal Environmental Research Letter, adding that the average annual operating costs would be around $ 3.1 billion a year for 15 years.

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