Sydney Australia : Michael Thomas Hill created Forgotten Songs, an installation of 110 empty birdcages suspended high in the air that play the songs of fifty birds that once lived in central Sydney before they were forced out by European settlement.
Banksy, one of the most infamous street artist ever. Banksy is a pseudonymous England-based graffiti artist, political activist, film director, and painter. His satirical street art and subversive epigrams combine dark humour with graffiti done in a distinctive stencilling technique. - See more at: http://geekshizzle.com/2013/07/05/complete-banksy-art-infographic/#sthash.SeDNSnm2.dpuf
By Wenching Yan (yuumei.deviantart...) [click on this image to find a short clip and analysis of the human cause of global warming]