What are the processes that can change a clean, balanced freshwater environment into a sick one? This film describes a variety of projects undertaken by scientists at Environment Canada's Freshwater Institute in Winnipeg. They are seeking the answer to this important question, and finding ways to restore and protect our freshwater world. This is a film of discovery: the vulnerability of our freshwater world, the damage we have already done it, and how we can help restore and protect it.
1974, 24 min 22 s
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