Human activity in the stratosphere is projected to increase in the coming decades. Space travel emissions have more than tripled in the past decade and growth is projected to accelerate. Furthermore, a variety of geoengineering measures would entail increased lower stratosphere (LS) aircraft traffic as well as the direct injection of aerosols into the stratosphere. Compounding the understanding of these sources is an increasing awareness of impacts from natural sources such as direct LS aerosol injections from large pyrocumulonimbus events. To date, it remains largely unknown how emissions from the anticipated uptick in anthropogenic stratospheric activity will interplay with natural sources and impact stratospheric climate and ozone. This session invites submissions on: the characterization of stratospheric emissions and sinks for both anthropogenic and natural sources; measurements of the chemical, microphysical, and optical properties of stratospheric emissions; modeling studies of stratospheric emissions assessing the radiative forcing and climate and ozone impacts.