Japan's big increase in sustainable investment assets from 2016 to 2020 means it accounts for 8 percent of the $35.3 trillion from the five major markets of Europe, the United States, Canada, Australasia and Japan.

That Japan is becoming a responsible investment success story is attributable to greater collaboration between policymakers, companies and the financial services sector to create a robust framework with environmental, social and governance (ESG) factors at its core.

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