1
Cutting down forests.
2
the protection of animals, plants, and natural resources
3
able to be used without being completely used up or destroyed
4
used to describe a type of animal or plant that has become very rare and that could die out completely
5
the whole mass of air that surrounds the Earth
6
Contamination of air or water by harmful substances.
7
The release of gases, usually by cars or factories, into the air.
8
restored or replaced by natural processes
9
a system in which waste materials are buried under the ground
10
the continuous absence of rain, thus causing the land to dry up.
11
to send (used newspapers, bottles, cans, etc.) to a place where they are made into something new
12
the gradual destruction of something by natural forces (such as water, wind, or ice) : the process by which something is eroded or worn away
13
a region with particular weather patterns or conditions
14
produced by or using the sun's light or heat
15
gases and vapor (usually harmful).
16
material that is left over or that is unwanted after something has been made, done, used, etc.
17
containing poisonous substances
18
to rot or decompose; also, to decline in quality, energy, etc.
19
Polluted air which is a mixture of smoke and fog.
