Across
- 1. The principle of reducing, reusing, and recycling waste.
- 4. The process of cutting down trees, often leading to habitat destruction.
- 9. Combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years.
- 10. Convert waste into reusable material.
- 14. A gas released when burning fossil fuels and a key contributor to climate change.
- 15. Energy that is collected from renewable resources that are naturally replenished.
- 18. The long-term rise in global temperatures due to human activities.
- 20. The variety of life in the world or in a particular habitat or ecosystem.
Down
- 2. The presence of toxic chemicals or compounds (including those of biological origin) in the soil, at levels that pose a health risk.
- 3. A site for the disposal of waste materials by burial.
- 5. The day when humanity has used more resources than the Earth can regenerate in a year.
- 6. Preservation, protection, or restoration of the natural environment, natural ecosystems, vegetation, and wildlife.
- 7. Melting glaciers and polar ice caps leading to higher sea levels.
- 8. Meeting the needs of the present without compromising the ability of future generations to meet their own needs.
- 11. Harmful substances contaminating air, water, or soil.
- 12. Small plastic particles that contaminate oceans and enter the food chain.
- 13. Harmful or toxic byproducts from industrial, agricultural, or household activities.
- 16. A biological community of interacting organisms and their physical environment.
- 17. Gases like CO₂ and CH₄ that trap heat in Earth's atmosphere.
- 19. The total amount of CO₂ emissions caused by an individual or group.