This is your brain (when you use it).

This is what happens when you don't use your brain.

wildlife (frog)

vs.

lugged hiking boots (create erosion)
mountain bike (knobby) tire (creates erosion)mountain bike (knobby) tire (creates erosion)
mountain bike (invades and destroys wildlife habitat)mountain bike (invades and destroys wildlife habitat)
mountain bikers destroy rainforest illegally to build their playground
mountain bikers destroy rainforest illegally to build play structures
a typical mountain biker carries his mountain bike on his SUVa typical mountain biker trashes creek habitata typical mountain biker trashes creek habitat
mountain bikers riding off-trailmountain biker riding off-trailteaching children it's okay to ride off-trail
mountain biker riding off-trailmountain biker jumping
mountain unicyclists riding illegally
mountain bikers destroying wildlife habitat to make a trail
mountain biking destroying a regional park
mountain biker killed by a bear in BCbroken bike (shows the kind of force that mountain bikers apply to the ground -- or anything else in their way!
mountain biking accident – no feeling below the waist
bicyclists intimidate pedestrians (Copyright 1997 Andrew B. Singer)
boats (invade wildlife habitat)raft (invades wildlife habitat)
jetski (invades wildlife habitat)jetski (invades wildlife habitat)
road (fragments habitat)road (fragments habitat)
roads fragment habitat (Copyright 1997 Andrew B. Singer)
Cars Kill Everything (Copyright 1998 Douglas Minkler)
heavy equipment (destroys wildlife habitat)

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