1
pollution is a serious problem
2
deal with habitually
3
the environmental is pollution
4
the heavy snowfall something to the town off completely
5
the veredict is seriuos but stable
6
study of the population
7
the study is very complete
8
explotacion of natural resources has had an environmental collide
9
the sdientist is goin to the result
10
region defined by a perimeter
