Across
- 1. Form or participate in a carpool
- 4. a major UN conference held in Rio de Janeiro
- 5. Clearing a wide area of trees
- 6. Increase in the overall temperature of the earth's atmosphere
- 7. make(vegetable matter/manure) into compost
- 8. Natural fuel formed in geological past from remains of living organisms
- 9. Process of a species of animals/plants becoming extinct
Down
- 2. Establishing a forest on land not previously forested
- 3. Overflow of a large amount of water beyond its normal limits
- 6. Gases in Earth's atmosphere that trap heat