Walmart Inc launched a programme on Thursday to help its Chinese suppliers cut the emission of climate-warming greenhouse gas by 50 million tonnes a year by the end of the next decade.

The move is part of a bigger push by the US retailing giant that aims to remove 1 billion tonnes of carbon dioxide from its global value chain by the end of 2030, equivalent to taking 211 million vehicles off roads for a year.

Walmart said it had created a specific programme for China that would begin with around 100 major Chinese suppliers and provide tools to measure emissions and set targets.

“We are working with our suppliers on areas such as energy efficiency, renewables, packaging, waste reduction, and thinking about areas like deforestation and improving energy efficiency,” said Laura Phillips, senior vice-president for sustainability.

The company aims to eventually expand the programme to its entire China supply chain.

Walmart has already enrolled 800 Chinese factories into an energy efficiency programme launched in 2014, helping them cut costs by $40 million a year, said Bill Foudy, Walmart's China-based vice president for global sourcing.

“It is often misunderstood that energy efficiency costs money, when we've found it to be the opposite,” he said.

China, the world's biggest producer of greenhouse gas, aims to cut its energy intensity - or consumption per unit of economic growth - by 15 per cent over the 2016-2020 period.

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