And he roams the badlands of the central Australian bush, where the red gums wait for the river to flood before releasing their seeds to be carried away and germinate downstream.

ECONOMIST: Trees

The houses, which were purchased by the city and must be moved away from the flood-prone Red River of the North or a creek that flows into it, are so large they can't be hauled to higher ground without being cut into pieces.

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The flow of the river, made constant by careful management to please consumers, did not suit the handsome river red gum trees along its banks, which thrive on drought and flood.

ECONOMIST: So long as it doesn��t cost too much