NGOs COP28

Organization for Poverty Alleviation and Development

Oro Verde Tropical Forest Foundation

Organisation de Defense de lEnvironnement et Development au Burundi

Orse

OSC Proyecto Musas AC

Organic Consumers Association

Opportunity Two Excel Foundation

Operation Earth

Our Childrens Trust

Our Climate Education Fund

OURS

OpenTeam

Overseas Development Institute

Overseas Environmental Cooperation Center

OXFAM International

Oxford Climate Policy

P3 Foundation

Pachamama Alliance

Open University of the Netherlands

Pacific Forest Trust

Open University

Pacific Institute of Public Policy

Pacific Rim Consortium for Energy Combustion and the Environment

Open Seas

Pact Inc

Stakeholder Forum for a Sustainable Future

ONG Change Humans Life

ONG Page Verte

Ontario Sustainable Energy Association

ONG CEUS Chile

Oneworld UK

One World Trust

One Sky Canadian Institute of Sustainable Living

One Planet Foundation

ONE Campaign

Omega Institute for Holistic Studies, Inc. (Omega Institute)

Oil Change International (OCI)

Oikos Institute

Oeko-Institut e.V. Institute for Applied Ecology

Oceana Inc.

Ocean Risk and Resilience Action Alliance Inc. (ORRAA)

Ocean Conservation Trust

Ocean Conservancy (OC)

Occidental College

Observer Research Foundation (ORF)

Observatoire pour la Protection de l Environnement et des Monuments Historiques de Tanger (OPEMH)

Observatoire méditerranéen de l énergie (OME)

O. Oe. Energiesparverband

Nuclear Information and Resource Service (NIRS)

Nuclear Industry Association (NIA)