Is desalination expensive

yes but the Carbon footprint will be increased by 180 kgs per 60, 000 of water and that equates to a full tank of gasoline, however, that is less than travelling from Perth to Sydney!

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On the other foot, the construction cost are very large, the running costs are big and on-going, and there is still resitance from the neighbors on the impact on the local community from construction and also from have a large, noisy, operating 24/7, industrial size building stuck on your local beach betwen the houses bought for the ocean view and the ocean.