PIRC and WWF produced an interesting report on this topic a few years ago: <a href="http:&#x2F;&#x2F;assets.wwf.org.uk&#x2F;downloads&#x2F;think_of_me_as_evil.pdf" rel="nofollow">http:&#x2F;&#x2F;assets.wwf.org.uk&#x2F;downloads&#x2F;think_of_me_as_evil.pdf</a>