welcome to "hardtalk," with me, zeinab badawi, from tate modern in london, where my guest has a major exhibition. he is the award-winning, icelandic-danish artist he is the award-winning, iceolafur eliasson.tist he believes that art can change the world by, for instance, helping to tackle climate change. this is one of his exhibits, a giant wall made of moss, and the idea iet people thinking differently about the environment. for instance, could oubuildinge with more sustainable materials. is this f thinking visionary or just sily farfetched? olafur erdasson, welcome to "halk." thu, zeinab. you had a fairly unorthodox upbringing. yoy parents were extremung when they had you-- your mother 20, you father 19-- born in iceland, moved to denmark. your mother was a seamstress, your father a cook. hodid your early life influence you and your work? well, my father moved back to icand, and so i always spent my vacations in iceland, whcking around in nature he was out painting. he also worked as an artist, actually, and my mother, then, in demark would make sure i would go to school, and wer ou