Description :

The effect of man on Nature. Sometimes it's possitive but most times
negative. The pictures should clearly display the influence of the
human factor on the natural environment * . whether it's good or bad for
it !
(When I say nature I mean flora and fauna.)

*Example :
A car in the middle of a forest doesn't clearly display the influence.
A dam on a beautiful lake, or a bridge in the middle of nowhere does!
A chained dog on a backyard doesn't
A sad lion caged on a city Zoo does.

Simple isn't it ?