The document discusses sustainable bridge design. It explores using materials like concrete, steel, aluminum and fiber reinforced polymer that are durable and can decrease environmental impact. Different bridge types are compared in terms of their environmental impact. Design considerations for sustainable bridges include using materials with low embodied energy, increasing durability to extend lifespan, and facilitating easy deconstruction and reuse of materials. Future concepts discussed include bridges that harvest solar and wind energy. The document reflects on the need for more innovative and sustainable bridge design to improve infrastructure for the future.