Windbreaks on the Prairies -- Film Description:
"Prairie farmers often ruthlessly cut down the few trees that stood in the paths of their plows. Too late, it was realized that without these windbreaks the top soil became even more vulnerable to erosion. The Dominion Department of Agriculture experimental station at Indian Head, Saskatchewan, cultivated acres of young trees for distribution to farmers."
-- National Film Board of Canada

Source:
National Film Board of Canada. "NFB -- Windbreaks on the Prairies" National Film Board of Canada. http://www.onf-nfb.gc.ca/eng/collection/film/?id=17557.