The study s focus is on the practices of environmental responsibility of the telecommunications company Oi, checking perceptions and participation of its employees about the company s actions and initiatives related to the environment. The study addresses the practices of environmental responsibility of Oi that are linked to three Global Compact principles related to the environment: take, develop and encourage. Interviews were conducted with two managers to better understand the environmental responsibility practices and how the company encourages and educates its employees to adhere to this conduct on a daily basis. We investigated the perception and involvement of employees about the practices of environmental responsibility of the company, through a questionnaire applied to employees of one specific Department. After the analysis it was concluded that the majority of the sampled employees are satisfied with the company´s environmental practices and know well the actions and initiatives of the company and participate in them.