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Scientists have come up with a bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet new idea to save bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet Earth from global warming. Geo-engineers from Harvard University believe that spraying "sun-dimming" bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet into the stratosphere bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet above the Earth could slow down global warming. They also say their bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet would be "remarkably inexpensive," costing in the bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet of $2.25 billion a year over a 15-year bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet. The technique is known as stratospheric aerosol injection (SAI). It is still in its infancy and is bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet to be proven. It would involve the use of gigantic bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet or high-powered chemical cannons to spray chemicals into the stratosphere to act as a bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet barrier against sunlight and harmful UV rays.

The scientists have admitted that their bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet is currently still in the planning bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet. They said: "We make no judgment about the bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet of SAI. We simply show that a hypothetical deployment program commencing 15 years hence, while bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet highly uncertain and ambitious, would indeed be technically bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet from an engineering perspective." Not all scientists think the idea is a good bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet. Some think it is somewhat bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet in the sky. They say it would require a fleet of 100 specially-designed bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet to make 4,000 missions a year, crossing most of the globe's airspace. This would require bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet from over 100 governments. There are also concerns it could increase droughts and extreme bothchemicalsdesirabilityhighhosesideaoneperiodpermissionpieplanesplanetpossiblereflectiveregionrevolutionarystagestechniqueweatheryet.