In 1991, Mount Pinatubo in the Philippines erupted with enough force to spew high amounts of gas and ash all the way into the stratosphere, which starts roughly 4 miles above the Earth’s surface.  The mushroom cloud injected an estimated 20 million tons of sulfur dioxide into this layer of the atmosphere, where it mingled … Continue reading Geoengineering Faces a Wave of Backlash Over Regulatory Gaps and Unknown Risks