How to Put Sulfur Into the Atmosphere

In 1991, a volcano in the Philippines called Mount Pinotubo spewed all these pollutants into the air. The global temperature dropped by 0.5 degrees Celsius. It reduced the amount of sunlight that reaches the earth by somewhere between 1 and 2.5%. So it's not like it's anything new, this whole idea of getting stuff into the atmosphere that drops the global temperature. And because we don't control volcanoes and when they erupt, we have to find different ways to put those aerosols into the atmosphere.