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The City of Cape Town needs to make budget provisions to clear the invasive alien trees which are guzzling Cape Town's water supply.

This is according to biodiversity scientist Jasper Slingsby.

Slingsby has argued that removing alien trees near water catchment areas should take precedent over other water augmentation schemes.

Read more: Invasive alien vegetation a major threat to Cape dam levels - scientist

He explains alien clearing is the most cost effective and poses the least risk to the environment.

Clearing aliens is going to be cheaper than any of the other alternatives.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

It's also much better in terms of environmental costs. Catchment restoration is only a benefit to the environment.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

There's also the employment argument which a big plus for a province full of farm workers sitting in a bad state.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

We're losing 10% of run-off [water] to aliens already.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

Take a listen to his analysis and reasoning:

This article first appeared on CapeTalk : Forget desalination, first clear alien trees to save CT's water supply - expert

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