Profiles 6 individuals: In Belgium a naturalist designed and runs his country's first national park. In Mexico a farm leader helps his people use ancient technology to grow their traditional crop, while preserving water and preventing erosion. In Siberia, a local biologist helps protect Baikal, the world's oldest and deepest lake. In Ecuador two men force a huge multi-national oil company to clean up 20 years of environmental damage; in Mozambique, a local musician teaches sustainable sanitation practices to the country's poor though his music; in Puerto Rico, a local housewife organized and galvanized her community to fight air pollution.