Letter: grazing pasture is a net carbon sink
9th April, 2010
The article, 'Have we got it right on meat and greenhouse gas emissions?' misses an important point made at the Oxford Real Farming Conference, which is that properly managed pasture is a net carbon sink
'Properly managed' in this context means that cattle (or other animals) are allowed to overgraze discrete areas, and then moved on, and the grass is the given a long time to recover before the next assault.
This simulates what happens in the wild, as the herds move over the grasslands.
After over-grazing the grass-roots die but because of the mycorrhizae within them they do not rot (or only very slowly), and the carbon locked within the roots significantly out-weighs the carbon in the exhalations of the animals. This is demonstrable and measurable.
This probably does not apply in short-term highly fertilized leys because they fail to build up mycorrhizae.
When ruminants are fed cereal they apparently exhale less carbon per animal but there is no compensatory gain because modern cereal production involves huge carbon loss.
Graham Harvey explains all this in his excellent book, 'The Carbon Fields'. The guy you quote in your piece, Dr Frank Mitloehner, is just putting the standard industry line. That is where the profit lies after all.
Have we got it right on meat and greenhouse gas emissions?
Analysis showing lower greenhouse gas emissions associated with intensive livestock production could pose a challenge to our views on best farming practice
Can cows help stop climate change?
Meat, dairy... in fact, livestock in general has in recent years joined the ranks of the 4x4 and the short-haul flight. But could a change in the way we graze animals not only reduce greenhouse gas emissions, but even remove them from the atmosphere?
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