Heat has larger impacts on labor in poorer areas
One additional day >32 °C (90 °F) lowers annual payroll by 0.04%, equal to 2.1% of average weekly earnings.
Environmental Research Letters
Papers published in Environmental Research Letters (ERP) and Environmental Research Communications (ERC)
Stratospheric aerosol injection tactics and costs in the first 15 years of deployment
While cheap, such an aircraft-based program would unlikely be a secret