Environment

5. The presence in or introduction into the environment of a substance which has harmful or poisonous effects
9. A visible mass of condensed watery vapour floating in the atmosphere, typically high above the general level of the ground(in the plural)
11. A gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants(in this sense, there are two sides, please write it all together)
13. The phenomena of the physical world collectively, including plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations

1. A small body of still water formed naturally or by artificial/man-made means,usually smaller than a lake
2. Container, typically plastic or metal, for household refuse(in the plural)
3. Return(material) to a previous stage in a cyclic process
4. The action of cleaning a wide area of trees
6. A very small pellet of plastic which serves as raw material in the manufacture of plastic products(in the plural)
7. The activity or business of growing crops and raising livestock
8. Worthless, unwanted material that is rejected or thrown out/away
10. A colourless, transparent, odourless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms
12. The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen