The climate is changing, and the people in the Arctic are facing huge challenges. Many rely on natural resources for both subsistence and income. Successful adaptation to climate change and the sustainable use of resources require observation of the environment. Scientific knowledge of the environment is incomplete, and conventional scientific monitoring is logistically difficult. Arctic citizens observe the environment all year-round. Their observations and knowledge are, however, not systematically used in the political decision process. An international symposium was therefore organized to encourage Arctic cooperation, and to exchange experiences, on the use of citizens’ knowledge and observations to document natural resources and inform the political process. The meeting drew participants from all the Arctic countries. Their discussions and conclusions are presented in this report.