Acid Rain: Factory and automobile exhaust, 50% - 75% from US, damage/kill plants and animals, pollutes lakes and rivers, passed laws to limit pollution, agreement with the US, Public Transportation, Algal Bloom: chemicals and fertilizers leak into lakes and rivers, green algae covers lakes, kills fish and other wildlife, laws to clean the water, Mining: Mining of minerals in Canadian Shield, over extraction leaks chemicals into the water, damage to environment and wildlife, new laws to limit mining pollution, Timber: clear-cutting large areas of trees, loss of wildlife habitat, damage ecosystems, less oxygen production, laws to eliminate clear-cutting,

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