“And if that was so important and improved everything so much，why are we nomads all over again，Mr.Arnold？”

　　Mr.Arnold didn't know what to say.Lucy was a very intelligent girl.He knew that she lived with her parents in a house，so she must know that her family were not nomads；so what did she mean?

　　“We have all become nomads again，” continued Lucy.“The other day，outside the city，they were cutting the forest down.A while ago a fisherman told me how they fish.It's the same with everyone：when there's no more forest left the foresters go elsewhere，and when the fish run out the fishermen move on.That's what the nomads did，isn't it？”

　　The teacher nodded，thoughtfully.Really，Lucy was right.Mankind had turned into nomads.Instead of looking after the land in a way that we could be sure it would keep supplying our needs，we kept developing it until the land was bare.And then off we would go to the next place！The class spent the rest of the afternoon talking about what they could do to show how to be more civilized.

　　The next day everyone attended class wearing a green T­shirt，with a message that said，“I am not a nomad！”

　　And，from then on，they set about showing that indeed they were not.Every time they knew they needed something，they made sure that they would get it using care and control.If they needed wood or paper，they would make sure that they got the recycled kind.They ordered their fish from fish farms，making sure that the fish they received were not too young and too small.They only used animals that were well cared for，and brought up on farms.

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