At the invitation of Researcher Cui Xuefeng, Professor Hans-F. Graf from the Atmosphere Research Center of Cambridge University came to ESPRE for an academic visit and delivered a report titled“Variable Effects of Volcanic Eruptions” in the morning of Apr. 18th 2012. The presentation was moderated by researcher Cui Xuefang, and attracted more than 40 faculties and students from ESPRE, ADREM, College of Global Change and Earth System Science and College of Resources and Technology.