Sun-dimming chemicals could solve climate change on the cheap

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