there is a little black box and that records the activity of the cow, how many steps she takes. ..and even how much they burp. when a cow comes into be milked, she will keep burping methane and that is sucked up the pipe, and we can measure the concentration of methane in her breath. all that data is fed into the professor s computers for painstaking analysis. it is very useful information. in the background, it automatically checks every single cow all the time. we have to cut emissions fast. earlier this month at the cop26 climate conference, the eu and us pledged to reduce methane by a third by 2030, but the research here suggests reducing the climate impact of the uk s grass fed cows means looking at the whole farm, not just for livestock.