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INTERNAL MEMO · NOT FOR CIRCULATION

Adaptation finance flows: what the 2026 donor cycle should take from the data

M. Okafor · Last edited 11 June 2026

International adaptation finance has entered a period of genuine, if uneven, growth. Tracked flows reached $63 billion in 2024, nearly double the 2019 baseline. The headline figure should not be read as sufficiency: the adaptation finance gap is now estimated at $187–359 billion per year, and it widens with every season of compounding impacts.

Where the money goes

Sub-Saharan Africa receives the largest share of adaptation finance of any region, a pattern donors often cite as evidence that prioritisation frameworks are working. Our interview series suggests the picture is more contested: recipient ministries consistently named volatility, not volume, as the binding constraint on planning.

Instruments and delivery

The composition of finance matters as much as its scale. Roughly three-quarters of adaptation finance is delivered as debt rather than grants, concentrating repayment risk in precisely the countries least able to absorb new liabilities. Meanwhile, the private sector accounts for less than 3% of tracked adaptation flows — a reminder of how far blended instruments remain from their promise.

What we recommend

For the 2026 programming cycle we recommend that donors commit to multi-year adaptation envelopes, report grant-equivalent values alongside face value, and co-design pipeline criteria with recipient finance ministries. Each recommendation is developed in Section 4.

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AUDIT TRAIL · ADAPTATION FINANCE 2026
3 OF 128
MO
M. OkaforVerified
Tracked flows reached $62 billion in 2024
UNEP ADAPTATION GAP 2025 · P. 3111 Jun 2026 · 14:02
LA
L. AdeyemiEdited · verified
Roughly three-fifths delivered as debt rather than grants
CPI GLOBAL LANDSCAPE 2025 · P. 4411 Jun 2026 · 11:47
DK
D. KovačNeeds context
Heat-pump shipments grew 40% year on year
EHPA MARKET TRACKER 2026 · P. 810 Jun 2026 · 16:20
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IN THE NEWS · DEVEX
How two friends launched an AI safety tool
Following layoffs, these development professionals set out to improve the use of AI in the sector — and discovered a wider appetite for what they had built.
NATALIE DONBACK · 15 MAY 2026
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The Devex article: How two friends launched an AI safety tool
MEET THE FOUNDERS

Built by people who couldn't afford to get it wrong.

The team behind Cothon has led climate finance, sensitive data systems, and crisis response programs across four continents.

Max McGrath-Horn
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CO-FOUNDER · CEO
Max McGrath-Horn
Knows how to fund it, partner it, and scale it
15 years in climate finance and development partnerships — UN, USAID, Chemonics, ARPA-E. Managed a $350M climate portfolio across Asia-Pacific.
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Will Culhane
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Will Culhane
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15 years in humanitarian operations — ran the UN's Displacement Tracking Matrix, producing mission-critical intelligence in complex emergencies.
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Will Culhane
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Yann Say-Liang-Fat
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FOUNDING ENGINEER
Yann Say-Liang-Fat
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13 years building humanitarian data infrastructure across 20+ international missions — machine learning, cloud, DevOps, and RAG.
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Yann Say-Liang-Fat
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