Across
- 2. WHEN GASES ARE TRAPPED IN EARTH'S ATMOSPHERE
- 5. HARMFUL OR ANNOYING LEVELS OF NOISE
- 6. THE SURROUNDINGS IN WHICH A PERSON OR AN ANIMAL LIVES
- 7. INTRODUCTION IN THE ENVIRONMENT OF HARMFUL SUBSTANCES
Down
- 1. ECONOMIC DEVELOPMENT CONDUCTED WITHOUT DEPLETION OF NATURAL RESOURCES
- 3. A COLOURLESS, ODOURLESS GAS PRODUCED BY BURNING CARBON
- 4. THE ACTION OF CLEARING A WIDE AREA OF TREES