Up to 800 million global workers will lose their jobs by 2030 and be replaced by robotic automation, a new report from a consultancy has found.

The study of 46 countries and 800 occupations by the McKinsey Global Institute found that up to one-fifth of the global work force will be affected.

It said one-third of the workforce in richer nations like Germany and the US may need to retrain for other jobs.

Machine operators and food workers will be hit hardest, the report says.

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