this post was submitted on 29 Mar 2025
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The Climate Crisis
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If livestock was restricted to non-arable land and not fed any arable crops : it would be a net positive, no?
No. Without addressing water sources, if livestock only produced carbon dioxide they might come close to net neutral, but the methane they produce is a huge component of their effect on the climate; that methane simply wouldn't be a factor if the land were left fallow. They also engineer the land, preventing the growth of forest and creation of peat in areas where it would naturally occur.
The methane cycle is from the ruminates eating the grass, which is to say the microbes processing grass. The grass is going to grow with or without ruminates eating it, and microbes will process the grass all the same in a stomach or out on the grassland. I.e. the methane load is a function of the plant growth and not of the animals.
Is that not correct?
No, removing livestock will generally lead to increased vegetation and biodiversity, longer growth and more photosynthesis. There would be an increase in plant litter leading to increased microbial activity - releasing some carbon as CO2, and sequestering most of the rest in the soil.
Methane production would occur in anaerobic conditions (e.g. waterlogged or more compacted soil,) but nowhere near as efficiently as it does in the rumen of livestock.