In recent years, London’s skyline has been changed by companies that have set the standard for working alongside energy and sustainability consultants to create low energy, high performance buildings. The list includes the Bloomberg building, which achieved the highest-ever Building Research Establishment Environmental Assessment Method (BREEAM) score in 2018. Also, listed the RSPB Environment & Education Centre. This structure was designed to use renewable energy sourced from a ground source heat exchange pump, and limit water usage with its rainwater harvesting system. It even used sheep wool to insulate the building.