Center for International Environmental Law (CIEL) | 32,023 followers on LinkedIn. Defending the right to a healthy planet since 1989 | The Center for International Environmental Law (CIEL) uses the power of the law to protect the environment, promote human health, and ensure a just and sustainable society. CIEL also has a vibrant intern program for law school students and fellows in both our DC and Geneva offices. Over its 30 years, CIEL has trained more than 400 interns from 53 countries, providing an important educational opportunity for lawyers in training; there are very few ways at an early stage of a legal career to obtain the in-depth experience and training in international environmental legal advocacy that CIEL can provide.