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- Ö-Klo (2)
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- Organisation for Economic Cooperation and Development (OECD) (85)
- Organization of the Petroleum Exporting Countries (OPEC) (4)
- ORGANOBALANCE GmbH (5)
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- Origene technologies, Inc. (1)
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- Origin Materials (40)
- Original Green Distribution (1)
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- OriginOil Inc. (6)
- Origins (3)
- Orineo BVBA (12)
- Orion Engineered Carbons (5)
- Orissa High Court, Cuttack (1)
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- ORLEN Poludnie (4)
- ORNAMIN (2)
- ORNL Oak Ridge National Laboratory (93)
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- Orsted (2)
- ORTA Denim (1)
- Ortessa Groep B.V. (1)
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- Orthex Group (2)
- OrthoLite, Inc. (3)
- Orthopädietechnik Dambeck (1)
- Osage University (3)
- Osaka Bio Headquarters (1)
- Osaka Gas (3)
- Osaka Metropolitan University (9)
- Osaka University (9)
- OSCHWALD ABC der Wohnidee GmbH (1)
- OSE Immunotherapeutics (1)
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- Oslo Airport Avinor (3)
- Oslo Science Park (1)
- Osmo Holz und Color GmbH & Co. KG (1)
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- Osprey UK (1)
- OSRAM GmbH (7)
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- Ostbayerische Technische Hochschule Regensburg (OTH Regensburg) (6)
- Ostdeutsches Wirtschaftsforum (1)
- Österreichische Akademie der Wissenschaften (ÖAW) (3)
- Österreichische Energieagentur (4)
- Österreichische Forschungsförderungsgesellschaft (FFG) (9)
- Österreichische Gesellschaft für Nachhaltiges Bauen ÖGNB (1)
- Österreichische Gesellschaft für Umwelt und Technik (ÖGUT) (17)
- Österreichische Volkspartei ÖVP (1)
- Österreichischer Biomasse- Verband (1)
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- Österreichischer Klimaschutzpreis (2)
- Österreichischer Wasser-und Abfallwirtschaftsverband (ÖWAV) (1)
- Österreichischer Wissenschaftsfonds FWF (6)
- Österreichischer-Gewerbeverein ÖGV (1)
- Österreichisches Institut für Bauen und Ökologie - IBO (1)
- Österreichisches Ökologie-Institut (1)
- Ostfalia Hochschule für angewandte Wissenschaften (5)
- Ostschweizer Fachhochschule OST (2)
- OSU College of Forestry (1)
- OSU College of Science (2)
- Oswal Petrochemicals Ltd. (1)
- Oterra (1)
- OTH Amberg-Weiden (1)
- Otoka Energy Corporation (2)
- Otsuka Pharmaceutical Group (1)
- OTTAN (1)
- Otto Graf GmbH (2)
- Otto Group (9)
- Otto Krahn Group (1)
- Otto-Schott-Institut für Materialforschung (1)
- Otto-von-Guericke-Universität Magdeburg (OVGU) (7)
- Oulun Energia (2)
- Outerknown (1)
- OutNature GmbH (4)
- OutNature GmbH (PreZero) (1)
- Outotec (1)
- Output Sports (1)
- Outremer shipyard (1)
- ÖVAF (Boku Wien) (3)
- Overseas Development Institute (ODI) (4)
- Overtreders W (1)
- OVG (NL) (1)
- OVP Venture Partners (2)
- Owens Corning (3)
- OWI Aachen (6)
- OWI GmbH (3)
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- Oxea (6)
- Oxeon AB (2)
- OxFA GmbH (2)
- Oxfam (8)
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- Oxford Martin School (Oxford University) (2)
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- Oxford Pharmascience Group Plc (1)
- Oxford Technology (1)
- Oxitec Ltd. (1)
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- Oxo-Biodegradable Plastics Association (3)
- OXXCU (1)
- Oxy Low Carbon Ventures (12)
- Oxyle (1)
- Oxylum (1)
- Oxylus Energy (8)
- Oy Karl Fazer (4)
- Oysho (2)
- Ozark Natural Foods (1)
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- Ozinga Bros. Inc. (1)
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