Just about everything that engineers do benefits society. Engineers develop the transportation systems that get us from place to place, design the buildings that we live and work in, the technology that delivers our electric, water and gas, the machinery that produces food for us and the medicine that keeps us healthy.
An engineer can choose a project to work on which he or she feels best benefits the environment. Whether it is producing prosthetic legs for the disabled or helping to clean up the environment or even improving the standard of living in third world countries