There are a huge number of groups that focus on food, farming and sustainability. Some are associated with Intergovernmental Organizations (IGOs) and fit in the broader category of Civil Society Organizations.
For all organizations, immediately go to the "About Us" section to determine the members of the organization and its purpose/mission. Once you have determined if the organization is credible and/or identified bias, go to the publications or resources section. The annual report is a good place to begin. Remember to also check the authors of reports to determine credibility or bias.