Scientists laid out a possible future geoengineering program whereby high-flying jets would spray microscopic aerosol particles into the atmosphere at latitudes of 60 degrees north and south – approximately Anchorage and the southern tip of Patagonia. If injected at a height of 43,000 feet / 13,000 meters (above airliner cruising altitudes), these aerosols would slowly drift poleward, shading the surface beneath slightly. Annual costs are estimated at $11 billion, less than one-third the cost of cooling the entire planet by the same 2°C magnitude.Read Long Article
