The 1991 eruption of Mount Pinatubo in the Philippines increased global albedo, resulting in a temporary cooling of the earth.
On June 15, 1991, Mount Pinatubo in the Philippines experienced the second-largest volcanic eruption of the century, and by far the largest eruption to affect a densely populated area. The eruption resulted in high-speed avalanches of hot ash and gas, massive mudflows, and a cloud of volcanic ash stretching hundreds of miles.
Albedo can be thought of as the earth's reflectivity, or how much incoming sunlight is reflected back into space. The primary determinants of global albedo are cloud cover and land ice cover (particularly in areas with large ice caps like Greenland and Antarctica).
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