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Biosequestration

As previously mentioned the vast proportion of CO2 in the atmosphere is naturally released and is in turn naturally absorbed.  Some is dissolved in rain and ultimately acidifies the oceans but a great deal is absorbed by plants in the process of photosynthesis; consuming water and usually releasing oxygen. 

This is a natural solar collector.  Plant absorption is increased if CO2 levels rise and plants have access to sufficient water and sunlight.  Trials have been undertaken at higher CO2 levels with a number of existing economic plants to determine such things as the ‘fertiliser effect’ higher water uptake and increased solar absorption. 

Obviously producing biofuel or food does not permanently sequester carbon and any credit should only apply the solar energy collected by the process; as this, in turn, reduces dependence on other energy sources. To get a full credit, similar technology might produce cellulose that could be charred and buried to improve soils or other carbon rich materials that could be safely buried in depleted mines or other suitable sites. Charing and burying of bagasse, straw and wood-waste is already a recognised sequestration technology.

It is clear that accelerated CO2 absorption by conventional agriculture and plants, for example by reticulating CO2 to greenhouses or forests, would be costly and would not fully deal with the vast quantities of CO2 involved.  But some plants and bacteria evolved when CO2 levels were very much higher and it appears to be possible to exploit their genome to modify them or other plants and organisms, to produce economically useful materials; at the same time absorbing large volumes of CO2.

Several projects are already in underway internationally.  The most interesting involve algae that could be used to produce diesel fuel, directly or as chemical feedstock.  Other, possibly complimentary, options include modifying food crops like rice (to a C4 plant) so that additional CO2 and sunlight are absorbed (and carbohydrate yields improved).

Again the problem is the scale required to make a difference. A very large solar collection area is required together with plentiful water.  Areas comparable to present broad acre agriculture will be required, probably as shallow lakes.  It would be particularly useful if algae that are comfortable in salt water could be adapted.

Again there are safety issues to be considered. These vast lakes or fields will be filled with genetically modified organisms and the regulatory environment relating to GM organisms and foods will need to be changed accordingly.

 

 


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Travel

South Korea & China

March 2016

 

 

South Korea

 

 

I hadn't written up our trip to South Korea (in March 2016) but Google Pictures gratuitously put an album together from my Cloud library so I was motivated to add a few words and put it up on my Website.  Normally I would use selected images to illustrate observations about a place visited.  This is the other way about, with a lot of images that I may not have otherwise chosen.  It requires you to go to the link below if you want to see pictures. You may find some of the images interesting and want to by-pass others quickly. Your choice. In addition to the album, Google generated a short movie in an 8mm style - complete with dust flecks. You can see this by clicking the last frame, at the bottom of the album.

A few days in Seoul were followed by travels around the country, helpfully illustrated in the album by Google generated maps: a picture is worth a thousand words; ending back in Seoul before spending a few days in China on the way home to OZ. 

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Fiction, Recollections & News

Getting about

 

 


This article contains a series of recollections from my childhood growing up in Thornleigh; on the outskirts of Sydney Australia in the 1950s. My parents emigrated to Australia in 1948 when I was not quite three years old and my brother was a babe in arms.
 

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Opinions and Philosophy

On Hume and Biblical Authority

 

 

2011 marks 300 years since the birth of the great David Hume.  He was perhaps the greatest philosopher ever to write in the English language and on these grounds the ABC recently devoted four programs of The Philosopher’s Zone to his life and work.  You will find several references to him if you search for his name on this website. 

 

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