Stock Photo - 22 August 2019, Schleswig-Holstein, Noer: Cows lie and stand on a pasture of the Lindhof sample with measuring instruments on their backs. The ruminants produce methane, a climate-damaging greenhouse gas. Researchers at the University of Kiel want to reduce methane production by using a mixture of herbs. In return, they tie the livestock to a belt of experimental material. Photo: Carsten Rehder/dpa. - Noer/Schleswig-Holstein/Germany

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