How artificially brightened clouds could stop climate change
In June, 1991, something surprising happened to the Earth. Mount Pinatubo, in the Philippines, erupted. The pressure built up over centuries beneath this dormant volcano caused the second largest eruption of the 20th Century, spewing vast amounts of white ash and sulphates as high as the stratosphere – 10 km above the Earth’s surface. As a result, the average global temperature that year dropped by 0.6C. And for some researchers, that raised an interesting possibility. Could we do this on purpose, deliberately producing artificial clouds reduce global warming?