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Renewable Energy Policy Network for the 21st Century. REN21’s goal is to facilitate knowledge exchange, policy development and joint action towards a rapid global transition to renewable energy. REN21 brings together governments, nongovernmental organisations, research and academic institutions, international organisations and industry to learn from one another and build on successes that advance renewable energy. REN21 is an international non-profit association and is based at the United Nations Environment Programme (UNEP) in Paris, France.