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- 2. Ecological Problems Ecology is a science about nature surrounding us. The main ecological problems are: air
- 3. Ecological Problems Many rivers and lakes nowadays are polluted with different waist products, which are very
- 4. Where Does Acid Rain Come from? People have leaved on the Earth for thousands of years.
- 5. Where Does Acid Rain Come From? The smoke from cars, factories and power stations go into
- 6. How Does Acid Rain Influence Trees? Acid rain influences deciduous trees like oak, beech and birch
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