Reflectivity Above the Clouds

Can we effectively reflect some solar energy before it gets to the Earth's surface?
The stratosphere is the cold layer of Earth’s atmosphere, it's above the troposphere wherein humans live and most weather occurs. The stable stratosphere is a prime location to deploy albedo interventions like reflective balloons or tiny reflective particles (aerosols) [1]. Increasing stratospheric reflectivity can mediate global warming while human cultures transition their economies away from burning fossil fuels [2]. However, if we increase stratospheric reflectivity and continue to increase fossil fuels reliance, it will then be more urgent than it is now to somehow offset warming forces because, if we stop maintaining the high reflectivity after CO2 levels have further increased, the earth will then become warmer than it is on a path to now [3]. How and where best to deploy stratospheric interventions remains?[4]. Space bubbles could be produced and deployed at LP1, the midway point between the Sun and Earth following their orbital path, aiming to create a constant sheild against the Sun's full force [5]. Some great material from the field of Solar Radiation Management: