A small bavarian town in the 80's. A summer day in an elementary school which happens to be across a leather-tanning-plant. One of the kids suddenly bursts out

A small bavarian town in the 80's. A summer day in an elementary school which happens to be across a leather-tanning-plant. One of the kids suddenly bursts out "hey look, why do all the trees suddenly turn brown?". The teacher is flabbergasted but wise enough to close all the windows immediately. Outside it looks like autumn is in full blow, while the sirens in the city go off and the road between school and plant fills rapidly with firetrucks, ambulance and police cars... It later turned out that one container had over-pressure and a chemical escaped trough an outlet... no people were harmed though but every leave in the vicinity turned completely brown...