Engineers are involved in all aspects of green building planning and design.  From the inception of a green building project through completion and occupancy, engineers review and modify plans, develop cost estimates and bids, manage contractors, and work to ensure that the building project meets all requirements in relation to feasibility, efficiency and safety.  Engineers committed to green building design practices focus on aspects such as affordable energy, resource efficiency, waste reduction, reuse and recycling, and alternative building techniques, materials and design processes, in order to achieve maximum results with minimal negative environmental impact.  LEED certification ensures commitment to environmentally responsible building practices.