[size=1.077em]Any moves to modify the Los Angeles River, to return parts of it to a more natural setting or to capture water, need to be implemented with care.
[size=1.077em]Scientists say the key job of the concrete channel, which has featured in countless films and pop videos, is to protect the city from damaging floods.
[size=1.077em]And that role is likely to become more challenging if climate change brings heavier rains, they argue.
[size=1.077em]Alternatives to the river's current brutalism will not be easy to find.
[size=1.077em]"This is not a simple problem; it's not a matter, for example, of taking out half the concrete," said Bill Patzert from Nasa's Jet Propulsion Laboratory.
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