This would be big trouble in respect to global cooling if this has a large eruption. You may also find this article to your liking (give it a read after): A Single Volcano is Capable of Changing Earth's Entire Atmosphere via Watts Up with That: The volcanic island of Krakatau (previously called Krakatoa) is situated in the Sunda Strait between the islands of Java and Sumatra in the Indonesian province of Lampung. The name is also used for the surrounding island group comprising the remnants of a much larger island of three volcanic peaks which was obliterated in a cataclysmic 1883 eruption. In 1927, a new island, Anak Krakatau, or "Child of Krakatoa", emerged from the caldera formed in 1883 and is the current location of eruptive activity. In the NASA photos below, you can see some stunning images of the volcano as it's been stirring to life again The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite acquired the wide view (top) on September 24.