World climate change has led to an alarming reduction in rainfall in much of Australia
An editorial in the 16 June issue of New Scientist draws attention
to the alarming effects of climatic change in the Australian continent.
Over the past half century, comments Tim Flannery of Macquarie University,
southern Australia has lost some 20 per cent of its rainfall, an effect
largely attributable to global warming, and similar changes have been
observed in the east of the country.
The flow of
the region’s rivers has fallen in recent decades by 70 per cent from their
previous figure. Apparently hotter soil temperatures have increased evaporation
and transpiration. Meanwhile, the northwest has experienced increased rainfall.
It has even been suggested that a large scale shift in population density might
have to be encouraged in order to follow the marked alteration in rain pattern.
Industry, power plants, farmers and households are claimed to be paying too
little for the water they consume. Some thrift in this direction may become
necessary.
Power generation should take greater account of the possibilities offered by
solar, wind and wave energy resources, and possibly cleaner grades of coal.
Irrigation throughout the continent needs to be reorganised. Rice and cotton
crops should
be planted during the odd
wet years and there should be no more permanent cultivation of grapes and citrus
fruits, which at present call for year-long water supplies.
Cities should encourage more installation of water tanks for houses, since
roof catchments are more efficient than dams in the provision of drinking water
supplies.
Desalination plants are helpful to ensure against drought. In Adelaide, Brisbane
and Sydney a need for desalinated water is growing urgent.
Australia may make its global contribution towards the reduction of greenhouse
gas emissions. Like the US it has so far failed to ratify the Kyoto protocol,
and this situation needs to be corrected urgently.
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