In the spring of this year, Lien released "Caribou Commons" and did a North American concert tour, communicating in music and images the possibility that the caribou, just like the once-thriving American buffalo, may be in danger of extinction. He hopes to focus environmental awareness, so that the caribou that have flourished in the Arctic for tens of thousands of years may be able to survive.
今年春天，馬修出版了《馴鹿宣言》，並展開全美巡迴演唱，用音樂和影像訴說馴鹿的故事，凝聚環保意識，以對抗威脅馴鹿生存的北美石油業，讓這群已在北極地區繁衍了數萬年的馴鹿得以存活。