Some organizations that are engaged in nature conservation

Global Nest is an international association of scientists, technologists, engineers and other interest groups involved in all scientific and technological aspects of the environment, as well as in the application of methods aimed at sustainable development. The main goal of the organization is to support and promote the dissemination of information on the most modern methods to improve the quality of life through the development and application of technologies and policies that are friendly to the environment.
Global Nest website

The World Society for the Protection of Animals (WHO) is an international non-profit animal protection organization that operates in more than 150 countries around the world and unites more than 900 organizations. WHO has 13 offices located in Australia, Brazil, Canada, Colombia, Costa Rica, Denmark, Germany, the Netherlands, New Zealand, Tanzania, Thailand, USA and UK, with WHO headquarters in London.
Site about environmental organizations

WWF until 1986 - WWF is an international non-governmental organization dedicated to nature conservation, research and environmental restoration. The organization's official name was changed from World Wildlife Fund to World Wide Fund for Nature, but the former name remains official in many countries. It is the largest independent conservation organization in the world, with about 5 million employees and volunteers worldwide, working in over 120 countries. Every year WWF implements over 1200 environmental projects, drawing the attention of millions of people to environmental problems and their solution. The organization operates on voluntary contributions, approximately 9% of its budget comes from private donations. WWF's mission is to prevent the growing degradation of the planet's natural environment and achieve harmony between man and nature. The main goal is to preserve the biological diversity of the Earth. The symbol of the World Wildlife Fund is the giant panda.
WWF (international site)