Notes from Xanadu
Our quarterly water bill came yesterday and water usage is down 10 per cent on the same period last year. Despite the marginal cost-benefit analysis of rain water tanks (most optimistic) and the probability of increasing the mosquito population, we are moving towards installing tanks. Below is the average household’s use of water.
The current Marrickville Matters (Dec 2009) is promoting the Council’s “Rainwater Tank Incentive Scheme” with rebates up to $2,000. To be eligible we must attend a Rainwater Harvesting Technical Workshop, which should be informative. Innovatively, these rebates are funded by the ratepayer’s storm water charge (will we still get charged for this?)
I have been reluctant to capture the rain water off our roofs mainly due to:
- How to distribute it
- Where to position the tanks
- And the problem of minimising mosquito habitat.
More on possible solutions after we attend the workshop.
Global Warming
I wonder why we can’t reach consensus on ‘Global Warming’, ‘Climate Change’, ‘Sea Level Rising (or is it falling’. I looked at these two articles and had some sympathy for the dilemma and debate within our Federal Opposition
“Heat’s on to approve carbon plan”, The Australian, 20 November, http://www.theaustralian.com.au/politics/heats-on-to-approve-carbon-plan/story-e6frgczf-1225799949696
KEVIN Rudd has seized on high temperatures across southeast Australia this week as proof of climate change and the need for the opposition to back his proposed carbon emissions trading system. Mr Rudd has also used the data to challenge opponents who doubted the reality of climate change to examine current weather patterns and reconsider their positions.
But leading climatologist Blair Trewin, of the National Climate Centre, said the heatwave could not “definitively” be linked to climate change. Dr Trewin said: “Any individual heatwave like the one we are having at the moment . . . you can’t say definitively it is because of climate change. “What we can say is as the overall average temperature increases, and there is a clear increase of average temperatures by 0.8C in the past century, we would expect the frequency of high extremes to increase and the frequency of low extremes to decrease.
Climate change sceptic William Kininmonth, a former head of the National Climate Centre, disagreed with a 2007 report by the CSIRO and Bureau of Meteorology that predicted more high extreme temperatures and bushfire dangers. Mr Kininmonth said the report’s predictions were “not going to come true”.
“These (heatwaves) occur randomly, and I don’t see see any reason they should come any more often.”
“Global temperatures could rise 6C by end of century, say scientists”, guardian.co.uk, 17 November, http://www.guardian.co.uk/environment/2009/nov/17/global-temperature-rise
Global temperatures are on a path to rise by an average of 6C by the end of the century as CO2 emissions increase and the Earth’s natural ability to absorb the gas declines, according to a major new study. Scientists said that CO2 emissions have risen by 29% in the past decade alone and called for urgent action by leaders at the UN climate talks in Copenhagen to agree drastic emissions cuts in order to avoid dangerous climate change.
The new study is the most comprehensive analysis to date of how economic changes and shifts in the way people have used the land in the past five decades have affected the concentration of CO2 in the atmosphere.
“Based on our knowledge of recent trends in CO2 emissions and the time it takes to change energy infrastructure around the world and on the response of the sinks to climate change and variability, the Copenhagen conference is our last chance to stabilise climate at 2C above preindustrial levels in a smooth and organised way,” said Le Quéré. “If the agreement is too weak or if the commitments are not respected, we will be on a path to 5C or 6C.”
But Le Quéré’s conclusion on the decline of the world’s carbon sinks is not universally accepted. Wolfgang Knorr of the University of Bristol recently published a study in Geophysical Research Letters, using similar data to Le Quéré, where he argued that the natural carbon sinks had not noticeably changed. “Our apparently conflicting results demonstrate what doing cutting-edge science is really like and just how difficult it is to accurately quantify such data,” said Knorr.
• The headline to this article was amended on Wednesday 18 November 2009 to make clear that the study said global temperatures could rise 6C by end of century, not that they will do so.
This correction seems to be the best summary of the problem.
Today’s Podcast
“The state of the arts”, ForaRadio, 18 November, http://www.abc.net.au/rn/foraradio/stories/2009/2744356.htm
Lyndon Terracini, the newly appointed artistic director of Opera Australia, voices his concerns about the state of the arts and outlines why he believes many of our cultural institutions must change.












