China Carbon Neutral Development Group Limited, an investment holding company, engages in the civil engineering and construction business in Hong Kong and Mainland China. The company is involved in the provision of civil engineering, and building construction and maintenance works, including waterworks; road and drainage works; landslip prevention and mitigation projects; slope and retaining wall maintenance works; and civil engineering of public facilities to government, public utilities companies, and private organizations. It also engages in the development, operation, management, and sale of carbon credit assets; provision of carbon neutral advisory and informatization service; development and operation of negative carbon emission business. The company was formerly known as Bisu Technology Group International Limited and changed its name to China Carbon Neutral Development Group Limited in April 2021. China Carbon Neutral Development Group Limited was incorporated in 2012 and is headquartered in Hong Kong, Hong Kong.