Here are some useful sites and blogs in no particular order:
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Earth Policy Institute
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Forum for the Future
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Global Footprint Network
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Green Sustainable Futures
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Reflections
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Rocky Mountain Institute
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Green Word
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Sustainability Outlook
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Sustain2Green
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International Institute for sustainable development
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United Nations Global Compact
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United Nations Environment Program
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United Nations Framework Convention on Climate Change
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Inter-governmental Panel on Climate Change
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350.org
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Eco-business
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2 degrees network
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Greenbiz
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Environmental Leader
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Triple Pundit
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Sustainable Business Guardian
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CSR Hub
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BSR
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Natural Capitalism Solutions
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Sustainable Brands
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Natural Logic
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Tree Hugger
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Sustainablog
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Greennovate
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Stanford Social Innovations