Teagasc, with partnership from Sheep Ireland, is leading a global project to incorporate genetic traits for low environmental impact, specifically low methane emission, into national sheep breeding schemes. Funded by the Department of Agriculture, Food and the Marine under the Green ERAHUB program, the project includes collaboration with sheep breeding nations such as New Zealand, Scotland, Norway, France, and Uruguay. The goal is to provide a platform for national and global comparison of methane and CO2 emissions for selective breeding, using portable accumulation chambers for individual animal methane measurements. The project also emphasizes the balance of methane reduction with profit traits and will provide recommendations for breeding programs, with the potential to meet policy targets for lower greenhouse gas emissions through genetic improvement.