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When is the Earth day? 2. What do people think about? 3. Do they know how to help our planet? 4. What is very important for life? 5. Why is the water not drinkable? 6. What is the deepest lake on the Earth? 7. Why is the lake Baikal in danger? 8. How has the climate changed for the last years? 9. What can harm the forests? 10. Why is the air polluted?