Cows Join Carbon Market in Quest to Curb Planet-Warming Burps This content was published on April 13, 2021 - 23:01 April 13, 2021 - 23:01 (Bloomberg) -- A European startup has started selling carbon credits for cattle raised on a feed supplement that reduces the amount of heat-trapping greenhouse gas they release. Mootral, based in Switzerland and the U.K., says its garlic-and-citrus feed can cut methane emissions from livestock by an average of 30%. Under its offset program, a certified farmer thatâs produced milk using Mootralâs supplement can sell credits equal to one ton of carbon dioxide to customers that want to offset their pollution.