Singapore, which now aims to raise between $1.9 billion and $2.4 billion from the debut issue, is a relative latecomer to the booming global market for sustainable debt. Europe is the dominant region for issuance, and fellow Asian financial hub Hong Kong raised HK$20 billion ($3.52 billion) via its first green bond for retail investors earlier this year.
Singapore began marketing its first green bond, choosing a 50-year tenor as it joins countries from South Korea to Egypt looking to fund the battle against climate change.
The debt maturing in 2072 will be available to both institutional and retail investors. Details on the price and the yield will be published later on Thursday, according to the Monetary Authority of Singapore.

