
Originally Posted by
waynep
it's actually a misnomer to call it "global warming", This leads people to think the only effect is the whole world is getting "hotter".
it's climate pattern change. ( ie longer droughts, larger floods and more frequent severe weather events )
the more worrying thing IMHO however is the acidification of the oceans. This has the potential to seriously harm the levels of plankton in the oceans , which is at the bottom level of our food chain.
There are a variety of effects likely - the latest one suggested is a new northern hemisphere ice age resulting paradoxically from the loss of the Greenland ice cap. Probably the fastest changes will result from changes in ocean currents, and these are rather unpredictable (the changes that is).
I have difficulties with the predictions of longer droughts, more frequent severe weather events etc, for several reasons. One is that the weather records are over such a short period relative to the natural variability that we have no way of knowing what the current variability really is, so these forecasts are entirely from modelling, and since the data does not exist to test the current frequency of these problems, it is a bit of a stretch to take note of predicted changes.
One point that is worth noting is that the predicted warming for this century is expected to be less than the temperatures reached in the Mediaeval warm period, a fact that a lot of people seem to ignore. Of course we now have far more people in the world than then, and far too many of them living in very vulnerable locations - many of which simply did not exist a thousand years ago (Much of the densely populated parts of SE Asia for example are land that has built up from sediment in that period - and is very susceptible to flooding).
It is "Global" in the sense that to the extent that it is caused by the emission of greenhouse gases, the problem is worldwide, not restricted to where the emissions came from. Because of this, although Australia will be affected by it, we can have no significant effect on it, except perhaps indirectly, and even that would be minimal - Australia has well under 1% of the world's population, and even though Australian emissions per capita are up among the highest (High living standards plus low energy costs and long distances) - if reduced by 50% or even 100%, the effect would be still be insignificant, being swamped by those countries with large populations, particularly those with high per capita emissions (US for example) or those with rapidly rising emissions (China, India for example).
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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