Global warming makes the Earth greener. Since 1912, the tree line has, on averge, moved up 1.5-2.7 m per year, says Torben Røjle Christensen.Publication date: Monday, January 6, 2014Link: http://jyllands-posten.dk/international/ECE6380822/global-opvarmning-goer-kloden…File attachments: Sibirien_Hinrich Baesemann.jpg