Introducing the CLEANED framework for environmental ex-ante impact assessment of livestock value chains - Lannerstad, Mats; Notenbaert, An Maria Omer; Paul, Birthe K.; Fraval, Simon; Ran, Ylva; Morris, J.; Koge, J.; Mugatha, Simon M.; Githoro, E.; Barron, Jennie; Herrero, Mario (International Livestock Research Institute, 2014)