"Protecting our planet : activities to motivate students to a better understanding of our environmental problems"@en . . . . . . . . . . . "Juvenile works"@en . "Provides information, projects, puzzles, word games and experiments to promote an understanding of six environmental issues: global warming, waste pollution, air pollution, water pollution, the ozone layer and hazardous waste."@en . "Protecting our planet : activities to motivate students to a better understanding of our environmental problems, for primary grades"@en . . . .