The National Health Service (NHS) is the publicly funded healthcare system of the United Kingdom, providing a comprehensive range of health services to residents. Established in 1948, the NHS is one of the world's largest and most efficient health service providers, known for its commitment to offering healthcare that is free at the point of use. The organization employs over 1.3 million people, making it one of the largest employers globally.

The NHS is committed to sustainability and has been actively working towards reducing its environmental impact. It has set ambitious targets to become the world's first net-zero national health service by 2040. The NHS has implemented various initiatives to reduce its carbon footprint, including improving energy efficiency in its facilities, reducing waste, and promoting sustainable travel options for staff and patients.

In its sustainability efforts, the NHS has been focusing on reducing emissions from its supply chain, which accounts for a significant portion of its carbon footprint. The organization is also investing in renewable energy sources and has been recognized for its efforts with several sustainability accreditations and certifications. However, detailed ESG reports and comprehensive carbon footprint calculations are not always publicly available, making it challenging to assess the full scope of its sustainability impact.