The US Government is the largest publisher in the world! It compiles and disseminates information on almost every topic, to help inform policy, determine needs, and spur innovation and growth of the economy.
For sheer depth of data and information, government information will be a rich source of supporting material for your projects.
World government organizations and international NGOs (Non-governmental organizations) often have a more encompassing charge, to determine characterisitcs and needs of humanity and the environment on a global scale.