This ABC article trying to justify seawater desalination sums up how so much damage has been done to Australian water policy over two decades. From the very first sentence “Perth’s desalination plant has been a lifesaver..”. What utter rubbish –
1 – Perth dam catchments bush could have been managed to release more dam inflows –
2 – The Gnangara Pines should have been immediately cut to increase aquifer recharge.
3 – The SW Yarragadee deep aquifer could have easily made up any Perth shortfall and any drawdown would hardly be noticed as SW WA aquifers waste water to the sea constantly.
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5 – The Agritech Wellington Dam project should have been the starting point for 4.
Perth was never running out of water – water has been running out of Perth.
Back to the ABC article – so these top climate scientists are saying that GCM’s are proving that increasing carbon dioxide driven climate change is causing the decline in SW WA rain. OK say we grant them that. Then how do we/they explain the increase in rain at various periods in the history of various Australian States and regions? Did CO2 do that too? The 14 BoM charts show that Australian rain has increased over a century and that most States and regions enjoy a wetter climate now than they did before 1950. How can anybody cherry pick the SW WA declining rain and say – Ah, that must be caused by IPCC Climate Change? I never hear any climate scientist say “the increase in rain from 1970 in many Australian regions must be caused by IPCC CO2 driven climate change”. I think a more rational view of Australian rainfall history would recognise – most of Australia is most often more dry than we humans would like. The 14 charts show with clarity that rainfall varies on decadal and sub decadal scales, often appearing to be cyclic, in different ways at different times in various regions for reasons we know little about – but we can opine and theorise.