273 Million Children. Four Years Left. What SDG4 Actually Requires
In 2023, I gave a TEDx talk at Brayford Pool in Lincoln. The question I was exploring was whether LEO satellite connectivity could deliver secondary-standard education to children who have no school to attend. Not a degraded version of education. Not a screen with some videos on it. A genuine, structured, curriculum-aligned secondary education — delivered via satellite to a repurposed smartphone, in places where building a school and employing a teacher is not happening and is not going to happen within the timeframe that matters.
That timeframe is 2030. And the scale of what needs to happen before then is the subject of this post.
What SDG4 Actually Says
Sustainable Development Goal 4 was adopted by all 193 UN member states in 2015 as part of the 2030 Agenda for Sustainable Development. It commits the world to ensuring inclusive and equitable quality education and promoting lifelong learning opportunities for all by 2030.
SDG4 is not a vague aspiration. It has ten specific targets, covering early childhood development, primary and secondary education, technical and vocational training, higher education, literacy, and the elimination of gender and disability-based barriers to learning. Target 4.1 specifically commits to ensuring that all girls and boys complete free, equitable and quality primary and secondary education by 2030.
All girls and boys. Quality primary and secondary education. By 2030.
That is four years from now.
The Scale of the Problem
Children and youth currently out of school globally (UNESCO, 2024)
Out-of-school children in Africa alone (UNESCO SDG4 Scorecard, 2025)
How far off-track the world already was from its own 2025 interim targets
The 2024 UNESCO Global Education Monitoring Report puts the out-of-school population at 273 million children and youth — comprising 79 million of primary school age, 64 million of lower secondary age, and 130 million of upper secondary age. The 2026 report describes the situation plainly: every two seconds, one more child needs to enter school just to stay on track with SDG4 targets. The world is not moving at that pace.
The 2025 SDG4 Scorecard, produced jointly by the UNESCO Institute for Statistics and the Global Education Monitoring Report, assessed how countries were progressing toward their own national education benchmarks. Its conclusion was that by 2025, countries were already off-track by 75 million children relative to the interim targets they had set for themselves. Not off-track relative to an ambitious external standard — off-track relative to what they themselves had committed to achieve.
Only one in six countries is currently on track to achieve SDG4 by 2030. If current trends continue, an estimated 84 million children and young people will still be out of school when the 2030 deadline passes, and approximately 300 million students will lack basic literacy and numeracy skills.
Why Children Are Out of School
The reasons 273 million children are not in school are not uniform. They cluster around several interlocking problems.
Geography. In sub-Saharan Africa, South Asia, and parts of Latin America, large proportions of the rural population live beyond the reach of functional school infrastructure. Distance to the nearest school is a genuine barrier — not inconvenient, but prohibitive. Children who must walk several hours to attend school often do not attend at all, particularly girls, whose families may not permit long unsupervised journeys.
Poverty. Even where schools exist and are notionally free, the indirect costs — uniforms, materials, foregone labour — price families out of consistent attendance. Children from the poorest households are disproportionately represented in the out-of-school population at every level.
Conflict and displacement. Approximately 50 percent of the world’s out-of-school children live in conflict-affected countries. School infrastructure is damaged or destroyed, teachers flee, and displaced families move repeatedly, making sustained enrolment impossible.
Teacher shortages. Sub-Saharan Africa faces acute and growing teacher shortages, with student-to-teacher ratios that make quality instruction practically undeliverable even where schools exist. UNESCO estimates the region will need millions of additional teachers to meet SDG4 — a supply that cannot be trained and deployed in four years.
Gender and social barriers. In some regions, cultural and legal barriers prevent girls from accessing education beyond primary level, or prevent disabled children from accessing any formal education at all. SDG4’s explicit commitment to inclusion makes these structural barriers a central concern, not a peripheral one.
The Children SDG4 Was Designed For — But Cannot Reach Through Conventional Means
Inside the 273 million figure is a subset that conventional education system expansion cannot realistically reach before 2030. These are children in locations where there is no school nearby and no credible prospect of one being built — not because no one cares, but because the economics and logistics of building and staffing permanent physical schools in remote, low-density, or conflict-affected locations make it impossible within a four-year window.
This is the category I explored in my TEDx talk. Not children who could be reached by fixing existing schools, training more teachers, or removing fee barriers. Children who are structurally beyond the reach of any conventional school-building programme, regardless of how much money is spent.
The question I was trying to answer was whether technology — specifically LEO satellite connectivity combined with AI-assisted learning and repurposed smartphone devices — could deliver secondary-standard education to this group directly. Bypassing the infrastructure problem. Not as a permanent substitute for a fully resourced education system, but as a credible bridge to meaningful learning outcomes for children who currently have none.
The framing that matters: SDG4 does not specify that education must be delivered in a building by a teacher standing in a room. It specifies inclusive, equitable, quality education. The question is whether technology can deliver quality — not just access — to children who are currently receiving nothing.
Where Satellite Connectivity Fits
Satellite connectivity is not a new idea in education. GEO satellite-based distance learning programmes have existed for decades. What has changed is the cost, the latency, and the scale of LEO constellations, which now make interactive, two-way, broadband-grade connectivity in remote locations economically viable in a way that was not true five years ago.
The UNICEF and ITU Giga initiative — which aims to connect every school in the world to the internet — has already demonstrated what connectivity can unlock in practice. In Sierra Leone, Giga has mapped all schools and connected 205; a browser extension developed with mLabs has been deployed in schools across multiple countries. In Rwanda, school-level connectivity investment attracted private ISP infrastructure investment that extended beyond the schools themselves. In Colombia, AI-assisted satellite imagery identified 7,000 schools not in official government datasets, enabling connectivity planning that governments could not have done alone.
These are schools. The harder category — children with no school to attend at all — requires a different model. It requires connectivity delivered directly to the child or to a community hub, with learning content and assessment that does not depend on a teacher being present. That is technically achievable with current LEO constellation coverage. The constraint is not the connectivity. The constraint is the educational design: what does secondary-standard learning look like when it is delivered via satellite to a device in a community without a teacher?
That design question is harder than the engineering question. And it is, ultimately, the question that determines whether technology can genuinely contribute to SDG4 for the hardest-to-reach children — or whether it delivers connectivity without learning.
What 2030 Actually Means
Four years is a very short time in education system terms. Building a school takes time. Training a teacher takes years. Extending a national curriculum to previously unreached populations involves policy, procurement, infrastructure, and professional development on a scale that cannot be compressed into four years for 273 million children.
The 2026 Global Education Monitoring Report is explicit: the evidence shows that progress is possible where equity is prioritised, policies are sustained, and systems focus on those furthest behind. But it also acknowledges that 2030 is close, the deficit is large, and the gap between commitment and delivery has been consistent for the past decade.
UNESCO’s own projection is that even if countries meet their own national targets — which they are currently not on track to do — the out-of-school population in 2030 will still be 107 million. That is the best-case scenario under current trajectories. The realistic scenario, absent significant acceleration, is worse.
The question SDG4 poses to anyone working in satellite communications, in educational technology, in AI, or in development financing is not whether we care about children being out of school. The question is whether the tools now available — LEO connectivity, AI-assisted learning, affordable devices, improving D2D coverage — can be combined into something that genuinely moves the needle for children that conventional approaches cannot reach, within a timeframe that actually matters.
That is what I was exploring in Lincoln in 2023. It is what I am still working on.
Final Thoughts
SDG4 is not a problem that satellite communications can solve alone. Teacher training, school infrastructure, government policy, and education financing are all essential components of the global response. But for the subset of 273 million children who are structurally beyond the reach of conventional school-building programmes, satellite connectivity is one of the few tools that can reach them at the speed the problem requires.
The technology exists. The connectivity infrastructure is being built — not for education, but for commercial D2D services that happen to illuminate the same geography where unreached children live. The educational design challenge is harder and less funded than the engineering challenge. And 2030 is four years away.
If you are working in satellite connectivity, educational technology, development finance, or humanitarian communications and want to explore how these tools intersect with SDG4, I am interested in that conversation.