The funds aim to help plug a large gap in funding for poorer countries struggling to meet the United Nations 2030 Sustainable Development Goals.
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Reliable checks on companies' sustainability credentials will take years to develop, auditors have said.
Firms will have to make sure that their suppliers are not using forced labor or child labor, and are not guilty of inadequate workplace health and safety, among other things.
In a market already divided, the attempt to reach a common definition for sustainable investments risk could fragment things further.
Major wins for ESG investors pushing for changes at companies this year included the replacement of three directors at Exxon Mobil.
Built on earlier promises to phase out coal, the policy would stay in line with the science of climate change and be reviewed annually.
Such pressures pose new challenges for the shipping industry, which hitherto largely hasn't been drawn into the center of the coal debate.
The deal announced late Saturday pushes countries to reassess business strategies and carbon footprints to reap monetary rewards, or lag and risk losses.
After years of complaints that there were no rules to determine what constitutes a "sustainable" investment, some are now fretting that soon there will be too many.
The U.N.-backed Principles for Responsible Investment predicted "dramatic" and "sweeping" changes in food, energy, transport and industry policy between now and 2025.