The natural environment includes
a. roadways.
b. mountains.
c. high-rise buildings.
d. motorized vehicles.

I think it could be mountains.. if I'm wrong then I'm sorry.. 

B. Mountains of course

Others are man made things

El nino is a weather phenomenon caused when warm water from the western pacific ocean flows eastward. part1baan average of 7.7 hurricanes and 3.6 major hurricanes compares to 5 hurricanes and 1.5 major hurricanes from 1995-2005

Answergovernment control over all imports and exports;