Carbon credit trading is already a multi-billion-dollar global industry. Figuring out how to tie struggling smallholder dairy farmers into the ever-expanding market for carbon offsets could open up vast sums of money to potentially transform these farmers’ lives while lowering their carbon footprint.
Governments across sub-Saharan Africa (SSA) have been busy encouraging and, where they can, supporting dairy operations to boost rural economies, nutrition, and food security. A detailed study issued last year by Rwanda’s Department of Agricultural Engineering revealed just how important dairy farming has become to the continent.
“Currently, smallholder dairy farms provide more than 80% of SSA milk production,” Hakuzimana et al. estimated in their review of the industry. The rise of smallholder dairy farming isn’t all upside, however. “Livestock in general and dairy farming, in particular, has significantly contributed to global warming,” the study concluded, finding substantial increases in emissions of carbon dioxide, methane, and nitrous oxide, the three major greenhouse gases.
Poor handling of manure is one culprit, the researchers determined. They also discovered Africa’s smallholder dairy farms have a much larger carbon footprint compared to commercial-scale operations, releasing almost four times as much CO2 per ton of milk produced compared to North American dairy farmers. “Africa emits the highest [greenhouse gases] per unit of milk and meat production,” their study showed.
Better inputs mean fewer GHGs
Hakuzimana et al. argue that adjusting the type of feed given to dairy cows may be the most efficient and cost-effective way to lower smallholder dairy sector emissions. Other agricultural scientists agree.
In an earlier study, the International Livestock Research Institute and Unique Land Use, a German agricultural sustainability consultancy, teamed up to review 382 smallholder dairy operations in Kenya to determine how they differ in their contributions to global warming, and why. They discovered the same inefficiencies revealed in the Rwandan study—smallholder dairy farms are far less productive than operations in Europe and North America but emit far higher levels of greenhouse gases (GHG) per unit of production.
Herein lies an opportunity. “Since the GHG intensity of milk production decreases as milk yield per cow increases, increasing productivity represents an important GHG mitigation strategy,” the ILRI-led study says. There are several ways to better manage smallholder dairy farms resulting in lower emissions per yield, but they discovered the best way is likely more concentrated feeding and less open grazing. Dairy operations that relied on open grazing only had substantially higher carbon footprints, they found.
“Promoting balanced feed rations and feeding concentrate according to cows’ needs across the lactation cycle could provide opportunities to both increase milk production and reduce the [carbon footprint] of milk production in central Kenya,” they found. “Supporting smallholder farmers to implement these mitigation options will require interventions at several levels in feed supply chains in the dairy sector.”
Studies out of Vietnam and Indonesia reached the same conclusion—less grazing and more (and better) feed can both increase milk production while lowering emissions intensities. In Vietnam, research led by Hue University found that feeding dairy cows a mixture of corn residues, rice straw, and elephant grass boosted the animals’ weight and milk output while lowering average farm methane output.
Indonesian agricultural scientists discovered that smallholder dairy farm emissions rose in the rainy season, pointing to a greater abundance of wild forage as a source of higher greenhouse gas output. Manure management was a critical factor, as well, but emissions “from forage cultivation was the main source of variability between farms” they concluded.
Funding a transition
Carbon markets try to internalize an externality—by making the avoidance or destruction of greenhouse gas pollution a fungible product that can be traded like stocks or bonds. Though there is little evidence that carbon markets actually put a dent in global warming, they are nevertheless becoming popular. More corporations are making so-called “net-zero” greenhouse gas emissions reduction pledges. Virtually all of them are factoring in purchases of emissions offsets to reach their goals.
Could carbon market money be tapped to supply smallholder dairy farmers with better feed, boosting their production while making this fast-growing agricultural sector relatively more eco-friendly? The academic literature suggests carbon accounting methodologies at dairy farms need to be tightened up first to provide investors with better clarity on how certain interventions will lead to quantifiable reductions in greenhouse gas output. These studies and more are important first steps. It’s next up to innovators to find ways to marry the interests of smallholder dairy farmers to emissions trading.
While our primary climate strategy at Grow Further is to help smallholders adapt to climate change, we’re also considering climate mitigation-related research that has multiple benefits for food security and farm income.
— Grow Further
Photo credit: A dairy cow at a farm in Ol Kalou, Kenya. International Livestock Research Institute.