For plant - based foods (with the exception of rice), emissions of carbon dioxide often are the dominant contribution and with nitrous oxide present in small percentages. (academic.oup.com)
For vegetable products, energy use often is the dominant contribution of carbon dioxide emissions, but nitrous oxide emissions related to nitrogen application and fabrication also may be significant. (academic.oup.com)
China has a dominant contribution to these net emission flows, but emissions embodied in its exports to developed countries have declined. (sciencedaily.com)