The objective of the five days of talks, the third summit of its kind after talks in Monterrey in 2002 and Doha in 2008, is ambitious: laying out the ground rules for a fairer world of inclusive, low-carbon growth.
Concretely, that means deciding how to fill a colossal annual investment gap in key sustainable development sectors for developing nations -- estimated at up to USD 2.5 trillion annually according to the UN's trade and development body UNCTAD.
"I urge world leaders and ministers gathered here this week... To exercise flexibility and compromise. Let's put aside what divides us and put aside our self-interest in favour of working together for the common well-being of humanity," Ban told the opening of the summit.
Preparatory talks in New York failed to yield an agreement on a common summit outcome, with rich nations --- many of which are embroiled in their own financing problems and reluctant to up their aid budgets -- pushing for greater private sector involvement and for emerging economies like China, Brazil and India to share the burden.
With much left to resolve during the summit, Oxfam policy advisor Claire Godfrey said success was far from guaranteed.
"What we don't want to see is platitudes and promises," she said.
"Any agreement that favours rich governments and commercial interests isn't worth the paper it is printed on.
The talks so far have seen governments 'sitting on their hands' and waiting for others to make the first move."
International tax rules that allow large companies to avoid tax end up costing developing countries USD 100 billion every year, according to Oxfam.
Rich countries, however, want decisions about international taxation frameworks to remain in the hands of the OECD and G20, where they control the agenda.
