| Revision as of 21:16, 9 October 2009 edit121.127.207.75 (talk) Garnaut on algal biosequestration← Previous edit |
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'''Biosequestration''' is the capture and storage of the atmospheric ] ] by an increased volume or quality of ] (through practices such as growing more trees and genetic engineering respectively), as well as enhanced soil carbon in agriculture. It has been crucial to the initiation, evolution and preservation of life and is a key policy concept in the ] debate.<ref>Ross Garnaut. The Garnaut Climate Change Review. Cambridge University Press. Melbourne (copyright held by Commonwealth of Australia) 2008 p558. Garnaut (p609) defines biosequestration as involving greenhouse gases in general.</ref> It does not generally refer to the sequestering of carbon dioxide in oceans (see ]) or rock formations, depleted oil or gas reservoirs (see ] and ]), deep saline ], or deep coal seams (see ]) (for all see ]) or through the use of industrial chemical ] (see ]). |
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== Plants and absorbing carbon from the Earth's atmosphere == |
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It is generally accepted by ] that the ] content of the ] since before the ] was 0.03 percent.<ref>JE Lovelock. Gaia. A New Look at Life on Earth. Oxford University Press. Oxford. 1989 p80</ref> The capture of atmosphereic C02 has been largely a function of absorption by sea water, vegetation and soils.<ref>Tim Flannery. The Weather Makers. The History and Future Impact of Climate Change. Text Publishing. Melbourne.2005. p29</ref> The capacity of the oceans to absorb C02 is decreasing.<ref>CL Sabine et al. The oceanic sink for anthropogenic C02 Science 2004; 305:367-71.</ref> Given the potential adverse effects of rising atmospheric C02 levels (see ]) this increases the importance of developing policies and laws that increase both the global amount and efficiency of photosynthesis and biosequestration. |
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== Reforestation == |
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Canadell and Raupach have outlined four major strategies to mitigate atmospheric ] through ] and preventing ]. First, to increase the amount of forested land through a reforestation process. Second, to increase the carbon density of existing forests at a stand and landscape scale. Third, to expand the use of forest products that will sustainably replace fossil-fuel emissions. Fourth, to reduce carbon emissions that are caused from deforestation and degradation.<ref>Canadell, J. G., Raupach, M. R. Managing Forests for Climate Change. Science. 2008; 320: 1456-1457</ref>A recent report by the Australian ] found that forestry and forest-related options are the most significant and most easily achieved ] making up 105 Mt per year CO2-e or about 75 per cent of the total figure attainable for the Australian state of Queensland from 2010-2050. Among the forestry options, the CSIRO report announced, forestry with the primary aim of carbon storage (called carbon forestry) clearly has the highest attainable carbon storage capacity (77 Mt CO2-e/yr) and is one of the easiest options to implement compared with biodiversity plantings, pre-1990 eucalypts, post 1990 plantations and managed regrowth.<ref>CSIRO An Analysis of Greenhouse Gas Mitigation and Carbon Biosequestration Opportunities from Rural Land Use. Canberra. 2009. http://www.csiro.au/resources/carbon-and-rural-land-use-report.html, last accessed 8 October 2009</ref> |
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== Enhanced photosynthesis == |
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Biosequestration may be enhanced by improving ] by modifying ] genes in plants to increase the catalytic and/or oxygenation activity of that enzyme.<ref>{{cite journal |author=Spreitzer RJ, Salvucci ME |title=Rubisco: structure, regulatory interactions, and possibilities for a better enzyme |journal=Annu Rev Plant Biol |volume=53 |issue= |pages=449–75 |year=2002 |pmid=12221984 |doi=10.1146/annurev.arplant.53.100301.135233 |url=http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.arplant.53.100301.135233?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%3dncbi.nlm.nih.gov}}</ref> |
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One such research area involves increasing the earth's proportion of ] photosynthetic plants. C4 plants represent about 5% of Earth's plant biomass and 1% of its known plant species,<ref>Bond, W.J.; Woodward, F.I.; Midgley, G.F. (2005). "The global distribution of ecosystems in a world without fire". New Phytologist 165 (2): 525–538.</ref> but account for around 30% of terrestrial carbon fixation.<ref>Osborne, C.P.; Beerling, D.J. (2006). "Review. Nature's green revolution: the remarkable evolutionary rise of C4 plants". Philosophical Transactions of the Royal Society B: Biological Sciences 361 (1465): 173–194</ref> A new frontier in crop science consists of attempts to ] C3 staple food crops (such as wheat, barley, soybeans, potatoes and rice) with the "turbo-charged" photosynthetic apparatus of C4 plants.<ref>David Beerling. The Emerald Planet. How Plants Changed Earth's History. Oxford University Press. Oxford 2007 pp194-195.</ref> |
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== Biochar == |
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] (charcoal created by ] of ]) is a potent form of longterm (thousands of years) ''biosequestration'' of atmosphereic C02 derived from investigation of the extremely fertile ] soils of the ].<ref>Laird, David A., The Charcoal Vision: A Win–Win–Win Scenario for Simultaneously Producing Bioenergy, Permanently Sequestering Carbon, while Improving Soil and Water Quality, Agronomy J 2008; 100: 178-181</ref> Placing biochar in soils also improves water quality, increases soil fertility, raises agricultural productivity and reduce pressure on ].<ref>Glaser, Bruno, Johannes Lehmann, and Wolfgang Zech, Ameliorating physical and chemical properties of highly weathered soils in the tropics with charcoal – a review. Biology and Fertility Soils 2002;35:219</ref> As a method of generating ] Rob Flanagan and the EPRIDA biochar company have developed low-tech cooking stoves for developing nations that can burn agricultural wastes such as rice husks and produce 15% by weight of biochar; while BEST Energies in NSW Australia have spent a decade developing an ] technology that can combust96 tonnes of dry biomass each day, generating 30-40 tonnes of biochar.<ref>Chris Goodall. Ten Technologies To Save The Planet. Green Profile. London 2008 pp 210-231</ref> |
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== Improved agricultural and farming practices == |
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Zero-till farming practices occur where there is much ] but ] is not used, so that the carbon-rich organic matter in soil is not exposed to atmospheric oxygen, or to the leaching and erosion effects of rainfall. Over grazing is reduced by moving cattle and sheep away from grazed areas for several months.<ref>Chris Goodall. Ten Technologies To Save The Planet. Green Profile. London 2008 pp 236-247</ref> Ceasing ploughing has been alleged to encourage more ] to become predators of wood-eating (and C02 generating) ], allows weeds to regenerate soils and helps slow water flows over the land.<ref>Peter Andrews. Beyond the Brink. ABC Books. Sydney. 2008 p40</ref> |
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== Implications for climate change policy == |
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Industries with large amounts of C02 emissions (such as the ]) are interested in ''biosequestration'' as a means of offsetting their ] production.<ref> Tom Fearon. Australia’s ‘massive advantage’ in bio-sequestration. Environmental Management News. Monday, 3 August 2009 </ref> In Australia, university researchers are engineering ] to produce ] (hydrogen and biodiesel oils) and investigating whether this process can be used to ''biosequester'' carbon. Algae naturally capture sunlight and use its energy to split water into hydrogen, oxygen and oil which can be extracted. Such ] production also can be coupled with ] using salt-tolerant marine algae to generate fresh water and electricity.<ref>Guy Healey. Pond life fuels bio research The Australian. July 23, 2008</ref>Many new bioenergy (]) technologies, including cellulosic ethanol biorefineries (using stems and branches of most plants including crop residues (such as corn stalks, wheat straw and rice straw) are being promoted because they have the added advantage of ''biosequestration'' of C02. <ref>International Energy Agency (2006). p. 8.</ref> Dedicated biofuel and biosequestration crops, such as switchgrass, are also being developed.<ref>Biotechnology Industry Organization (2007). pp. 3-4.</ref> The ] recommends that a carbon price in a ] scheme could include a financial incentive for ''biosequestration'' processes.<ref>Ross Garnaut. The Garnaut Climate Change Review. Cambridge University Press. Melbourne (copyright held by Commonwealth of Australia) 2008. p558</ref> Garnaut recommends the use of ] biosequestration to absorb the constant stream of ] emissions from ] generation and ].<ref>Ross Garnaut. The Garnaut Climate Change Review. Cambridge University Press. Melbourne (copyright held by Commonwealth of Australia) 2008 p432.</ref> |
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== Barriers to increased global biosequestration == |
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The ] notes many such barriers. "There must be changes in the accounting regimes for ]. Investments are required in research, development and commercialisation of superior approaches to ''biosequestration''. Adjustments are required in the regulation of land use. New institutions will need to be developed to coordinate the interests in utilisation of ''biosequestration'' opportunities across small business in rural communities. Special efforts will be required to unlock potential in rural communities in developing countries."<ref>Ross Garnaut. The Garnaut Climate Change Review. Cambridge University Press. Melbourne (copyright held by Commonwealth of Australia) 2008. p582 </ref> |
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== References == |
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