Costain has taken the major responsibility of carbon efficiency drive by offering the low carbon options for the clients while bidding. Costain has stated that by 2023 every proposal for the client includes at least one low carbon option. This is the action plan of Costain to deliver the low carbon solutions including ‘Scope 3’ emissions for every client by 2023. Many Specialist firms and designers are encouraging for the development of decarbonizing solutions.