Cattle, biggest contributor to global warming: UN. The increasing world population, a new UN report warns, would lead to further increase in the number of livestock as demand for meat and milk increases and that would mean emission of more greenhouse gases. [News Source]

Cattle biggest contributor to global warming: UN. The increasing world population, a new UN report warns, would lead to further increase in the number of livestock as demand for meat and milk increases and that would mean emission of more greenhouse gases. [News Source]