New Zealand's livestock industry has begun a genetic program called the ‘Global first’ project with an aim to tackle climate change. As part of the project, the industry will breed low 'methane-emitting' sheep. Approximately one third of the total greenhouse gas emissions in the country come from livestock. Breeders who want to produce these low-methane rams or male sheep will have to measure a 'methane breeding value'. This process would have no negative impact on farm productivity, say researchers.