1
endangered
2
global warming
3
energy source
4
pollution
5
fuel
6
flood
7
disposable
8
renewable
10
to preserve
11
storms
12
to protect
13
poisonous
15
wild
16
thunder
18
countryside
19
harmful
20
drought
23
5
3
12
4
22
16
11
2
9
6
1
18
17
8
20
14
19
21
10
13
7
15
