There is a large EU project which looks at the role of legumes (eg. peas) in human nutrition and also as an animal feed. On the matter of peas as a feed alternative to soy the project finds that peas can provide a realistic substitute for soy in feeds for animals of all types and that this would yield GHG and lower energy use benefits, albeit modest (the analysis takes into account land use change impacts of soy production eg. deforestation).

The Swedish Institute for Food and Biotechnology (SIK) has produced two reports, one on the GHG emissions arising from the Swedish production and the other on emissions arising from the consumption of meat, milk and eggs between 1990 and 2005. The studies show the different findings you get if you take a production