India confronts a $6.5 trillion funding shortfall in its bid to achieve Net Zero emissions by 2070, with international capital required to cover at least 40 per cent of that gap, according to a report by Australian economist Nicki Hutley, released ahead of the COP31 UN climate conference. The findings underscore the scale of the financial challenge facing the world's most populous nation as it attempts to decarbonise one of the planet's largest and fastest-growing economies.

Scale of the Financing Need

Drawing on NITI Aayog analysis, the report estimates India's cumulative financing requirement at $22.7 trillion by 2070 to complete its Net Zero transition. The energy sector alone accounts for roughly half of that total, reflecting the magnitude of grid expansion, renewables deployment, and fossil-fuel phase-down required. Domestic capital, according to the report, can realistically provide just over 70 per cent of this — leaving a structural gap that must be bridged through international flows.

Domestic Reforms India Must Pursue

The report argues that even domestic capital mobilisation at the projected scale will require significant structural reforms. These include expanding corporate bond markets, mobilising pension savings, encouraging insurance sector investment in climate assets, and scaling up green bond issuance. Notably, the report suggests collaboration with more established capital markets in advanced economies could help India accelerate these reforms — framing international partnership not merely as a source of grants, but as a catalyst for domestic market development.

Broken Promises on International Climate Finance

The report traces the origins of the international climate finance obligation to the UNFCCC text of 1992, which formally required developed nations to support developing countries financially. More than three decades on, progress has been, in the report's framing, 'stymied.' Following the 2009 Copenhagen Accord, developed nations committed in 2010 to provide $100 billion per annum by 2020 to address the needs of developing countries. That target was met — but two years late, only in 2022, and with roughly half the sum sourced from multilateral development banks (MDBs) rather than individual developed-country governments. The report also points out that a portion of that finance represented reallocation from existing aid budgets, meaning no new money entered the overall pool.

Adaptation Finance: A Growing Second Front

The report warns that stalled action on emissions mitigation has compounded the problem: developing economies now require adaptation finance in addition to mitigation funding, stretching an already under-resourced system. 'Copious talk has produced insufficient new commitments from either the public or private sector, and funding remains well below required levels,' the report states. It adds pointedly that advanced economies are 'not walking the walk.'

What the COP31 Moment Means for India

The report's release ahead of COP31 is deliberate timing. Climate finance is expected to be a central battleground at the conference, with developing nations — India prominently among them — pressing for binding commitments that go well beyond the now-outdated $100 billion benchmark. For India, the numbers in this report provide a data-backed basis for its negotiating position: that the transition to Net Zero is not merely a domestic policy goal but a globally financed obligation, rooted in more than 30 years of international agreements. How COP31 responds to that argument will shape the credibility of the entire multilateral climate finance architecture.