The Humane Society has a very well done explanation of why factory farming allows diseases like Swine Flu and Avian Flu to flourish and mutate. It's pretty good educational material with some good statistics which might be helpful in our efforts to change zoning laws or just neighbors' opinions.
http://www.organization.org/farm/resources/pubs/swine_flu.html
(available to watch online or purchase the DVD for like $3)
http://www.organization.org/farm/resources/pubs/swine_flu.html
(available to watch online or purchase the DVD for like $3)