Growing, not transporting, creates most greenhouse gas emissions in food/agriculture sector of economy, which, in total, makes more than one third of global greenhouse gas emissions, UN agency says (click 'See also'). Rearing livestock makes 37 percent of human-induced methane (at 23 times the warming potential of carbon dioxide) and 65 percent of nitrous oxide (at 296 times more powerful than CO2). Livestock sector provides jobs for 1.4 billion.