NC Cotton Field                                              digital

Aside from stark aesthetic expression Hemp, Cotton and Synthetic Polyester production comparisons for me comes down to which least effects the environment? Hemp clearly is superior in what it gives back to Earth. 

from Stockholm Environment Institute:
http://www.sei-international.org/mediamanager/documents/Publications/Future/cotton%20hemp%20polyester%20study%20sei%20and%20bioregional%20and%20wwf%20wales.pdf

from Slate written by Brian Palmer;
http://www.slate.com/articles/health_and_science/the_green_lantern/2011/04/high_on_environmentalism.html (spends more line space trying to be a non partial journalist.)