References & Sources
Every number on this site is traceable to a published source. Below you'll find the full bibliographic references plus suggested reading for anyone who wants to dig deeper.
Primary Data Sources
IEA (International Energy Agency)
- World Energy Investment 2023 — $630B mitigation / $130B adaptation split figures. IEA tracks global energy investment by category annually.
- IEA Net Zero by 2050 pathway analysis — baseline for "halving emissions by 2030" target.
UNEP Adaptation Gap Report
- Adaptation Gap Report 2023 — $215–385B/year developing-country adaptation need by 2030. Published annually by the UN Environment Programme's Adaptation Gap Team.
- Full report: unep.org/adaptation-gap-report-2023
World Bank
- Gates, Climate Change in 2050: A Map of Global Impact — $1.8T cost of inaction projection. Also: Groundswell report on climate migration (216M internal migrants by 2050).
- Climate Investment Opportunities in the Sahel and Beyond — investment opportunity database and analysis.
- Climate Change and Energy Access in Sub-Saharan Africa — energy access and poverty analysis.
IPCC (Intergovernmental Panel on Climate Change)
- AR6 Synthesis Report: Climate Change 2023 — "well below 2°C" target and emissions gap analysis.
- AR6 Working Group II: Impacts, Adaptation and Vulnerability — regional impact projections and adaptation assessment.
OECD
- Rising Risks, Rising Stakes: A Deepening Climate Crisis (2025) — analysis of climate risk trends, including South Africa case study.
World Economic Forum
- Climate risk reports and global risk assessments — $4.5T/year climate investment gap estimates.
Other Institutional Sources
- Adaptation Fund — official site, annual reports, project database.
- Green Climate Fund — official site, GCF Readiness programme, project portfolio.
- IPCC — full AR6 assessment reports, synthesis report, regional fact sheets.
Suggested Reading
For the Funding Gap
- Finance for Climate Change: How We Can Make It Happen (The Economist, 2025) — explains the $4.5 trillion/year gap, carbon markets, and the need for policy signals over subsidies.
- Climate Finance Architecture — OECD analysis of multilateral climate fund governance and reform proposals.
- The Green Climate Fund: A Critical Assessment — various policy analyses on GCF governance and disbursement challenges.
For Adaptation Strategy
- Nature-Based Solutions to Climate Change — UNEP and IUCN joint publications on ecosystem-based adaptation.
- Climate-Resilient Development — IPCC AR6 WGII Chapter 5 on adaptation pathways and co-benefits.
- Early Warning Systems for All — UN WMO initiative on universal early warning coverage by 2027.
For Global Climate Governance
- The Paris Agreement: A Guide — UNFCCC official guide to the Paris Agreement structure, NDCs, and global stocktake process.
- Climate Justice and Loss & Damage — various publications on the Warsaw International Mechanism and COP28 Loss & Damage Fund.
For Data and Visualization
- Climate Interactive — interactive models (C-Learn) for understanding emissions scenarios.
- Our World in Data — CO₂ emissions and greenhouse gas data, visualized and downloadable.
- IPCC AR6 WGI Data Viewer — official IPCC data portal.