…and I hope you all are enjoying the cute British spelling – like tonne and demonise…
YES Organic #3. Greenhouse gas emissions and climate change
Despite organic farming’s low-energy methods, it is not in reducing demand for power that the techniques stand to make the biggest savings in greenhouse gas emissions. The production of ammonium nitrate fertiliser, which is indispensable to conventional farming, produces vast quantities of nitrous oxide – a greenhouse gas with a global warming potential some 320 times greater than that of CO2. In fact, the production of one tonne of ammonium nitrate creates 6.7 tonnes of greenhouse gases (CO2e), and was responsible for around 10 per cent of all industrial greenhouse gas emissions in Europe in 2003.
The techniques used in organic agriculture to enhance soil fertility in turn encourage crops to develop deeper roots, which increase the amount of organic matter in the soil, locking up carbon underground and keeping it out of the atmosphere. The opposite happens in conventional farming: high quantities of artificially supplied nutrients encourage quick growth and shallow roots. A study published in 1995 in the journal Ecological Applications found that levels of carbon in the soils of organic farms in California were as much as 28 per cent higher as a result. And research by the Rodale Institute shows that if the US were to convert all its corn and soybean fields to organic methods, the amount of carbon that could be stored in the soil would equal 73 per cent of the country’s Kyoto targets for CO2 reduction.
Organic farming might also go some way towards salvaging the reputation of the cow, demonised in 2007 as a major source of methane at both ends of its digestive tract. There’s no doubt that this is a problem: estimates put global methane emissions from ruminant livestock at around 80 million tonnes a year, equivalent to around two billion tonnes of CO2, or close to the annual CO2 output of Russia and the UK combined. But by changing the pasturage on which animals graze to legumes such as clover or birdsfoot trefoil (often grown anyway by organic farmers to improve soil nitrogen content), scientists at the Institute of Grassland and Environmental Research believe that methane emissions could be cut dramatically. Because the leguminous foliage is more digestible, bacteria in the cow’s gut are less able to turn the fodder into methane. Cows also seem naturally to prefer eating birdsfoot trefoil to ordinary grass.
NO GMO #3. Contamination and gene escape
No matter how hard you try, you can never be sure that what you are eating is GM-free. In a recent article, the New Scientist admitted that contamination and cross-fertilisation between GM and non-GM crops ‘has happened on many occasions already’. In late 2007, US company Scotts Miracle-Gro was fined $500,000 by the US Department of Agriculture when genetic material from a new golf-course grass Scotts had been testing was found in native grasses as far as 13 miles away from the test sites, apparently released when freshly cut grass was caught and blown by the wind. In 2006, an analysis of 40 Spanish conventional and organic farms found that eight were contaminated with GM corn varieties, including one farmer whose crop contained 12.6 per cent GM plants.
10 reasons why organic can feed the world
By Ed Hamer and Mark Anslow,The Ecologist, March 2008
10 reasons GM won’t feed the world
Mark Anslow,The Ecologist, March 2008
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