Global volcanic activity is an imperfect proxy, however. For instance, about 20% of present day global volcanic SO2 emissions are from a few volcanoes in Vanuat

Global volcanic activity is an imperfect proxy, however. For instance, about 20% of present day global volcanic SO2 emissions are from a few volcanoes in Vanuatu (Yasur, Lopevi, Ambrym, Ambae, Gaua and Vanua Lava).