Some of the world's biggest retailers and food companies including Kellogg Co., Walmart Inc. and Nestle backed a new initiative on Wednesday to improve global supply chains amid rising consumer demand for slave-free goods and services.

The Consumer Goods Forum (CGF) — which represents about 400 leading retailers and manufacturers across 70 countries — said it is creating a benchmark to support the development of more socially and environmentally responsible supply chains.

The Sustainable Supply Chain Initiative (SSCI) will advise buyers and suppliers on third-party auditing and certification schemes with the aim of boosting sustainable sourcing and reducing audit duplication and complexity, according to the CGF.