1
Gases that are expelled by factories
2
the process of collecting and changing old paper, glass, plastic, etc. so that it can be used again
3
damage caused to water, air, etc. by harmful substances or waste
4
to make an area or substance, usually air, water, or soil, dirty or harmful to people, animals, and plants, especially by adding harmful chemicals
5
waste material or things that are no longer wanted or needed
6
trash, wastepaper, or garbage lying scattered about
7
an unnecessary or wrong use of money, substances, time, energy, abilities, etc.
8
cause to fill or become covered with water, especially in a way that causes problems
9
gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health
10
a rule, usually made by a government, that is used to order the way in which a society behaves
11
turn from something solid into something soft or liquid, or to cause something to do this
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