System for geoengineering to reduce solar radiation

A system for solar geoengineering to facilitate the reduction of solar radiation impacting Earth's surface, the system comprising:

• a plurality of porous polymeric particles;
• and
• a means for dispersing the plurality of porous particles into Earth's stratosphere at an average distance of at least 10 kilometers above sea level,
• wherein each of the plurality of porous particles comprises a continuous polymeric phase composed of one or more organic polymers, and discrete pores dispersed within the continuous polymeric phase, and
• each of the plurality of porous particles has the following properties:
• a mode particle size of at least 2 μm and up to and including 20 μm;
• a coefficient of variance of the particle size of no more than 20% compared to the mode particle size;
• and
• a porosity of at least 20% and up to and including 75%;
• and
• the discrete pores have an average pore size d (in nanometers) that is defined by the equation:
• 0.3≤d/A≤0.8 wherein 2 is at least 400 nm and up to and including 3,000 nm;
• and
• wherein each of the discrete pores is filled with air and optionally filled with a pore stabilizing hydrocolloid that is disposed at the interface of the discrete pore and the continuous polymeric phase.