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Japan's public and private sectors will need to invest a total of 150 trillion yen ($1.2 trillion) in decarbonisation over the next 10 years to help achieve the nation's ambitious goal of becoming carbon neutral by 2050, the industry ministry said on Friday.

The estimate was unveiled as part of an interim report on the country's clean energy strategy which is expected to be finalised later this year.

"A great competition has already begun in which first movers have an advantage in the decarbonisation area," Koichi Hagiuda, Japan's Minister of Economy, Trade and Industry, told a panel of specialists which has been discussing the strategy.

It is essential for the government to offer support measures not only for research and development but also in various other areas on an unprecedented scale, allowing the private sector to make investment decisions with foresight, he said.

In April, the ministry said a 17 trillion yen investment would be needed in decarbonisation for 2030 alone by which time Japan aims to cut its emissions by 46% compared to 2013 levels.

[Ritsuko Shimizu and Yuka Obayashi]

More: Japan needs to invest $1.2 trillion in decarbonisation over 10 yrs, industry ministry says

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