Conflict

Harmony does not seem to match with mankind.

Pollution

Trees know how to purify the air,
Rocks know how to clean up water,
The earth knows how to invigorate the nature,
Humans only know how to pollute!

Exhaust

Only when the last tree has died,
The last river has been poisoned
And the last fish has been caught
will we realize that we cannot eat money.

Strike

It's not because you're almost out of gas
That you could abort your journey!