The head of the baby bull vanishes beneath a green plastic hood. He takes a handful of dry pellets in his mouth, chews, flicks his ears, and lets out a breath. The hood is mounted to a movable device that resembles a sophisticated mobile pizza oven and is on wheels.
However, the only thing being cooked here is an accurate measurement of methane, a powerful gas with an influence on global warming over a 20-year period that is 84 times greater than that of carbon dioxide (CO2).
The bull’s breath, filled with gas from his digestive tract, is hoovered up by a fan at 40 litres (8.8 gallons) per second, and monitored in this equipment known as a GreenFeed system.
The bull’s breaths and burps are recorded over a few minutes of munching in order to develop