DGE Group is a consultancy for environmental sustainability. We help our clients make the world a cleaner and safer place. With specialist knowledge and an approach characterized by trust, dialogue and positive energy, we effectively contribute to a sustainable development. Global Thinking – Local Delivery DGE Group is a partner in the global cooperation Inogen Environmental Alliance, Inc. With offices located on every continent, more than 4,330 staff worldwide, and projects completed in more than 120 countries, Inogen provides for a geographic reach unparalleled in the industry.