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Welcome to Center for Resource Solutions Center for Resource Solutions CRS is a nonprofit that creates policy and market solutions to advance sustainable energy. Since 1997 San Francisco CA Technical and Policy Leadership CRS engages with policymakers utilities and NGOs around the world to assist in improving the policy climate for renewable development. Greene Certification Center for Resource Solutions Greene certification program is the trusted global leader in clean energy certification. We make it easy for businesses and individuals to purchase verified clean energy with confidence and for consumers to choose sustainable products and services.