Wal-Mart is reportedly planning to ask its suppliers to measure and report their greenhouse gas emissions.

The US retail giant, which owns Asda in the UK, will quiz more than 60,000 suppliers and use the data to cut costs by comparing similar companies to spot which are less efficient, according to reports in the Financial Times.

It plans to test the move on 30 companies in seven product categories before rolling it out to its 68,000 suppliers, the reports add.

“Our objective here is to find efficiencies in the supply chain,” said Jim Stanway, head of Wal-Mart's global supply chain. “If we remove carbon, which equates to energy, which equates to cost, we fulfil our objective of getting low prices to the customer and having a positive environmental impact.”