AAP: Methane-emitting cows and sheep are the target of a new research project to cut greenhouse gas emissions and tackle climate change. Livestock are the third largest source of carbon emissions in Australia, with a beef cow grazing in northern Australia believed to produce 1,500 kilograms of carbon per year. Federal Agriculture Minister Tony Burke on Wednesday unveiled a $26.8 million program in support of 18 projects over four years as part of Labor’s climate change research …