Acid rain
http://archives.cbc.ca/IDD-1-75-584/science_technology/acid_rain/

Great Lakes pollution
http://archives.cbc.ca/IDD-1-75-1390/science_technology/great_lakes_pollution/

Clear cutting
http://archives.cbc.ca/IDD-1-75-679/science_technology/clearcutting/

David Suzuki
http://archives.cbc.ca/IDD-1-75-663/science_technology/david_suzuki/

Genetically modified foods
http://archives.cbc.ca/IDD-1-75-1597/science_technology/genetically_modified_food/