Eco-nationalism is when people believe that protecting the environment is an important part of being a part of that nation. This means that people from the same nation work together to create a healthier environment for everyone in that nation. People might do things like plant trees together, clean up garbage, or help protect wild animals from becoming extinct. Eco-nationalism also helps build strong relationships with other nations that share a belief in caring for the environment. By forming strong partnerships with other nations, countries can help each other make progress in protecting the environment.