Cows and methane under the spotlight
When world leaders gathered for the COP26 summit in Glasgow, there was much talk of methane emissions and belching cows.
The Global Methane Pledge, led by the US and EU and now with many country signatories, aims to reduce methane emissions by 30% by 2030. This is seen as a “quick win” to reduce global warming and will have major implications for livestock production.
Livestock have become the villain of climate change. Some researchers claim that 14.5% of all human-derived emissions come from livestock, either directly or indirectly. There have been widespread calls for radical shifts in livestock production and diet globally to address climate chaos. But which livestock, where? A new report argues it is vitally important to differentiate between production systems.
Not all meat is the same. Extensive, often mobile, pastoral systems – of the sort commonly seen across the African continent have hugely different effects to contained, intensive industrial livestock production.
Yet, in standard narratives about diet and production shifts, all livestock are lumped in together. Cows are misleadingly equated with polluting cars and beef with coal. However, a much more sophisticated debate is needed.
Some types of livestock production, especially those using industrial systems, are certainly highly damaging to the environment. But industrial systems are only one type of livestock production. And aggregate emission figures do not pick up the nuances of this reality. Looking across life-cycle assessments – a technique widely used to assess the impacts on climate change from different agri-food systems – the report found some important gaps and assumptions.
One is that global assessments are overwhelmingly based on data from industrial systems.
Research in Kenya, for example, shows how assumptions about emissions from African animals are inaccurate. Such livestock are smaller, have higher quality diets due to selective grazing and have physiologies adapted to their settings. They are not the same as a highly bred animal in a respiration chamber, which is where much of the data on emission factors comes from.
Another issue is that most such assessments focus on emissions impacts per animal or per unit of product. This creates a distorted picture; the wider costs and benefits are not taken into account.
Then there’s the fact that methane and carbon dioxide have different lifetimes in the atmosphere and are not equivalent.
It also matters what baseline is used. Pastoral systems may not result in additional emissions from a “natural” baseline.
A more rounded assessment is necessary. Extensive livestock contribute to emissions, but it’s simultaneously true that they produce multiple environmental benefits – including potentially through carbon sequestration, improving biodiversity and enhancing landscapes.
Animal-source foods are also vital for nutrition, providing high-density protein and other nutrients, especially for low-income and vulnerable populations and in places where crops cannot be produced.
Across the world livestock – cattle, sheep, goats and more – provide income and livelihoods for many. The world’s rangelands make up over half the world’s land surface and are home to many millions of people.
As countries commit to reducing methane emissions, a more sophisticated debate is urgently needed, lest major injustices result. The danger is that, as regulations are developed, verification procedures approved and reporting systems initiated, livestock systems in Africa and elsewhere will be penalised, with major consequences for poor people’s livelihoods. Source : https://www.dailymaverick.co.za/article/2021-11-28-cows-and-cars-should-not-be-conflated-in-climate-change-debates/