It is a delineation of the Safe Seed Initiative by the Council for Responsible Genetics. Companies who adopt this pledge do not knowingly buy or sell genetically engineered or modified seeds or plants.
Some people poo-poo the list because some of the companies who signed the Safe Seed Pledge had purchased some seed from Seminis seed house that was subsequently bought out by Monsanto – hence the perceived link between some honestly safe seed companies and Monsanto. These companies responded and stopped buying seeds from Seminis, to be true to their Pledge and their values.
The other reason the Safe Seed Pledge is poo-poo’d is because of the phrase “we pledge that we do not knowingly buy or sell genetically engineered seeds or plants ”. The word ‘Knowingly’ has been criticized as not good enough, but is used because of the possibility of contamination from genetically modified plants, by such situations as wind bringing pollen onto an organic farm, which is out of the control of the farm (and isn’t making them happy either).
Check out our recommended seed companies which genuinely care about you getting safe seed: http://www.priorunitygarden.com/pns.htm