7. References:
Hardin, G. (1968, December). The Science Magazine
http://www.sciencemag.org/content/162/3859/1243.full
Smith, A. (1776). The Wealth of Nations
http://en.wikipedia.org/wiki/Adam_Smith
Photos:
http://www.publicdomainpictures.net/view-image.php?image=11689&picture=flock-of-sheep
flock of sheep
http://calitreview.com/273
Castle Bravo Atomic bomb
http://www.tapio.fi/perhe_jametsa
iso perhe
http://www.cartinafinland.fi/fi/picture/68793/Talvi+-+talvimaisema+-+Koli.html
talvimaisema
http://www.iltalehti.fi/sydan/2011022513254441_sd.shtml
pollution