Nitrous oxide emissions largely come from nitrogen fertilizer usage and from animal manure; though its current levels are a thousand times less than carbon dioxide, it lasts much longer and is rising rapidly Nitrous oxide emissions largely come from nitrogen fertilizer usage and from animal manure; though its current levels are a thousand times less than carbon dioxide, it lasts much longer and is rising rapidly Environment Health News, Wellbeing Tips, Diseases, Treatment and Nutrition | The Hindu