Cow agriculture is responsible for nearly a quarter of the world’s emissions of methane, a potent greenhouse gas.
contains an organic compound called bromoform, which inactivates an enzyme that normally helps the methane reaction along. This research has raised concerns that the milk of dairy cows fed the algae may contain toxic levels of bromoform as well as iodine in their milk and meat. The U.S. Environmental Protection Agency has assessed bromoform as a probable human carcinogen, and too much iodine can cause thyroid malfunction.
In the new study, Ramin and colleagues added algae to four dairy cows’ feces. Two had been fed the algae, and two hadn’t. Each fecal sample was divided further, with one subsample given additional algae and the other left alone. Then, all the fecal samples were allowed to incubate, slowly decomposing in the laboratory. After nine weeks, the team analyzed the subsamples to see how much methane they contained.
But adding the algae directly to the feces did make a noticeable difference to methane coming from decomposition. That, the team says, suggests that this would be an effective part of the solution to the larger cow-methane problem.
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