FILE PHOTO: Sun rays shine through trees in a forest on an autumn morning near Biere, Switzerland, September 26, 2018. REUTERS/Denis Balibouse/File Photo
LONDON (Reuters) - Spraying sun-dimming chemicals high above the Earth to slow global warming could be "remarkably inexpensive", costing about $2.25 billion a year over a 15-year period, according to a study by U.S. scientists.
Some researchers say the geo-engineering technique known as stratospheric aerosol injection (SAI) could limit rising temperatures that are causing climate change.
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