Fill in: warming, fuels, smog, layer, spill, greenhouse, conservation, waste.
1. The ...... changes around the world.
2. Pollution from cars and factories has created a thick ..... above the city.
3. Recycling and composting are environmentally-friendly methods of disposing ......
4. Sea levels are rising due to global ......
5. 200 miles of coastline was polluted by the oil ......, killing thousands of birds and other marine wildlife.
6. This year, we'll be planting 1,000 trees as part of our ...... project.
7. Fossil ....., such as petroleum, are non-renewable resources because they take a long time to replace.
8. Scientists believe the hole in the earth's ozone ..... is shrinking.

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