> It lasts for days in the lower troposphere but years in the stratosphere I addressed this in my other reply. Table 1 of the study you cited stated that the r

> It lasts for days in the lower troposphere but years in the stratosphere I addressed this in my other reply. Table 1 of the study you cited stated that the residence time of stratospheric water vapor is measured in days. I'm not seeing a lifetime of years in that study. > however lithium-air is much more energy dense (volumetrically) Maybe. Lithium-air absorbs oxygen when it is operating. Not sure how to calculated this though.