Scientists have a idea to save Earth from global warming. Geo- believe that spraying "sun-dimming" chemicals above the Earth could slow down global warming. They say this would be " inexpensive," costing about $2.25 billion. The is called aerosol injection (SAI). It would need , high-powered to spray into the stratosphere. This would be a barrier against .
The said their idea is still in the stages. They said: "We show that a deployment program, while both highly uncertain and , would indeed be possible." Some scientists think the idea is in the sky. They say special planes would need to make 4,000 a year across the globe's airspace. Over 100 would need to agree to this. It could increase droughts and weather.