A new study finds that livestock disease outbreaks, such as bird flu, generate millions of tons of greenhouse gas emissions, but vaccinating livestock can significantly reduce these emissions. The research, published in One Health Outlook, revealed that livestock systems accounted for about 12% of all human-caused greenhouse gas emissions in 2015, and without intervention, global livestock emissions are projected to reach nearly 9.1 gigatonnes of CO2 equivalent by 2050. Livestock vaccination has significant climate benefits, but there are barriers to widespread adoption, particularly in low-income countries due to various constraints.