chemicals used in farming

I came across your e-mail address through the net and was womdering if you could
help me out.
I am participating in a debate regarding enviromental clean up and farmers.
The Birt is as follows:
Be it resolved that Canadian farmers should be responsible for all enviromental
clean up costs associated with the use of hazardous materials.

We are to agrue the affirmative side.

May question to you is that culd you provide me with any insight, statistical
data (clean up costs), added benefits of organic farming, or any other ideas you
might have.

I would greatly appreciate a reply and sincerely thank you for your time.
Heidi Dutton, Student at the University of Saskatchewan, Canada