You can manage environment variables for your Netlify projects using the Netlify CLI, which allows you to set and get values without leaving your terminal. To use this feature, first install the Netlify CLI and link your local project to a Netlify site. You can then create or update environment variables, check their values, delete them, list all available variables, import from files, and access them during local development with Netlify Dev. This feature supports centrally managed team environment variables for use across multiple projects.