Solar Radiation Modification (SRM) is a suite of possible technologies to counteract global warming by reflecting incoming solar radiation.
Some SRM proposals involve the injection of reflective aerosols into the stratosphere; others include cirrus cloud thinning and marine cloud brightening.
In all cases, SRM proposals are intentional human interventions in the climate system that aim to reduce global warming by increasing the reflectivity of the Earth rather than by decreasing human greenhouse gas emissions.