The AESOP and IFHP communities are greatly indebted to the University of Latvia, Faculty of Geography and Earth Sciences for hosting 6th lecture within AESOP-IFHP Lecture Series.

Our special word of gratitude goes to Prof. Zaiga Krisjanewho made the event possible.

Last, but not least we would like to express our gratitude to Prof. Cliff Hague for his outstanding lecture.