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At her farm nestled in the green hills of northwestern France, Marie-Francoise Brizard is helping to curb a planet-wide menace: farting and belching cows implicated in global warming.
So far this year, Brizard says she has cut methane emissions from her herd of 40 Normandy cows that are equivalent to 32 tonnes of climate-changing carbon dioxide.
That is equal to the carbon pollution spewed out in a 470,000-kilometre car journey, according to a computer tracker provided to Brizard by a French initiative that promotes lower methane output from farms.
She does it by feeding the cattle more grass but less maize and soy, cutting down on the cattle's output of methane, which comes mostly from belching but also from flatulence.
Ruminant animals emit methane, a gas that is more than 20 times more efficient than carbon dioxide in trapping the sun's heat.
Agriculture contributes an estimated 20 per cent of global greenhouse gas emissions, which the world's governments hope to curb in a climate pact to be negotiated in a November 30-January 11 conference in Paris.
Methane accounts for 40 per cent of farming's heat-trapping emissions.
As his wife leads the cattle to milking at the 100-hectare farm in Mayenne, a district of the Pays de Loire region, Luc Brizard sets out to sow seeds: alfalfa and other fodder rich in proteins alternating with cereals.
Dried alfalfa allows the couple to feed the cattle in winter without recourse to industrial maize- and soy-based feed which makes up a fifth of the diet of an average herd in France. The cattle also get a small supplement of linseed grown on site. Legumes such as alfalfa and oilseeds such as linseed and some beans enrich the milk with Omega-3 fatty acids, which are claimed to have health benefits for humans but which also suppress the bacteria that produce methane. The cows thus emit less of the gas. "The story is almost too good. But it is based on a principle of stunning simplicity: cows are made to eat grass," said agronomist Pierre Weil, joint founder of the "Bleu-Blanc-Coeur" (Blue-White-Heart) initiative, which promotes food products with higher levels of the valued Omega 3 protein.
The scheme has been certified as a bona fide method of lowering greenhouse gas emissions by the French national institute for agricultural research and by the UN Framework Convention on Climate Change.
Under a "business as usual" scenario of greenhouse gas emissions, average global temperatures are predicted to rise by about 4°C (6.4°F) by the end of the century, leading to more droughts, deadly superstorms and higher seas, according the UN's top science panel.
Methane emissions from cattle can be cut by as much as 65 per cent depending on the feed, according to the French initiative, which aims for a more modest reduction of 20 per cent so as to achieve the best balance between economic constraints, milk quality and animal health.
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