Preserving the environment and changing the way human beings interact with the world are the principles of sustainability. This is a complex issues that involves several factors such as preservation, generation of green energy and awareness of sustainable use. To be put into practice, these actions require large investments in research, planning and works. Heleno & Fonseca works actively in this area, carrying out representative works that involve the management of urban waste, the treatment of sewage and industrial waste, the recovery of degraded areas and reforestation.