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Across 2. An effect caused by humans, that heats the world and causes the ice caps to melt. 5. When too many people are born. 7. The effect of trapping the suns heat inside the atmosphere because of the atmospheres tinnes. 8. A fog like effect, that happens in very densly polulated cities because of the air pollution. 9. The avarage weather conditions in a certain place. 10. What barrier that seperates us from the endless abyss of cosmos. 12. The element that pollutes the air, also plants turn this into fresh air. 15. Definiton for cutting down trees and reducing forests to flat land. 16. A name for something that can be created again, one that isnt limited by the current amount we have. 17. A general description of humans creating waste, on kand water or air. 18. The increas of more and more people living in towns and cities. 19. Doing this will reduce waste, and help the world get less poluted.

Down 1. The definition for the impact in pollution a single person has on the planet. 3. Materials that have been formed naturally without the help of humans, which we still use. 4. The term for gasses that create a greenhouse effect. 6. A community of organisms and their physical environment interacting together 9. The process of making something dirty, poisonus or even radioactive. 11. A definition for all kinds of diferent life forms in a given area. 13. The place where an organism makes its home. 14. The study of the relationships between living organisms, including humans, and their physical environment