Sea Weed (IMAGE) Penn State Caption Asparagopsis taxiformis is shown here after it was harvested in the Azores. Active ingredients in the seaweed, called bromoforms, interfere with the ability of microbes in cows' rumens to make methane. Credit Hristov Research Group/Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.