It set out a detailed roadmap to net zero using science-based targets aligned to the UN ambition of limiting global warming to 1.5 degrees Celsius.
The retailer launched Plan A in 2007 and claims to have been the first major retailer to reach carbon neutral status in 2012.
Under the terms of its new credit facility, M&S will benefit from a lower interest rate if it delivers targets aligned to its net zero roadmap.