Aircraft contrails have a measurable effect on surface temperature so you might don't need as much as one might think. https://globalnews.ca/news/2934513/empty

Aircraft contrails have a measurable effect on surface temperature so you might don't need as much as one might think. https://globalnews.ca/news/2934513/empty-skies-after-911-set-the-stage-for-an-unlikely-climate-change-experiment/ https://globalnews.ca/news/2934513/empty-skies-after-911-set... https://www.forbes.com/sites/arielcohen/2021/01/11/bill-gates-backed-climate-solution-gains-traction-but-concerns-linger/ https://www.forbes.com/sites/arielcohen/2021/01/11/bill-gate... I'm sure he won't be a Mr. Burns trying to sell more power when reducing the effect of solar panels.