As a sustainability engineer, you design and develop products, buildings, and systems to meet certain sustainability specifications or certifications, such as the BREEAM standards for sustainable building or LEED building certifications. Your specific responsibilities differ based on the industry you are in, such as construction, agriculture, or manufacturing. Some engineers work in manufacturing, for example, designing low-energy light bulbs or electric vehicles. Others work in civil engineering where they coordinate and manage large-scale sustainable building projects, including residential and commercial buildings, public parks, or industrial plants.