Sigma Gamma Epsilon - The National Honor Society for the Earth Sciences | 88 followers on LinkedIn. The Society of Sigma Gamma Epsilon was established to recognize scholarship and professionalism in the Earth Sciences. | The Society of Sigma Gamma Epsilon was established to recognize scholarship and professionalism in the Earth Sciences. It has for its objectives the scholastic, scientific, and professional advancement of its members and the extension of relations of friendship and assistance among colleges and universities which are devoted to the advancement of the Earth Sciences.