Three Billion Lives Protected Through the Polycrisis Century: How technological diffusion and sustainable development can reduce human suffering by 2100

<p dir="ltr">The report argues that by 2100, <b>about three billion people</b>—roughly <b>29% of the projected global population</b>—could be durably protected from major deprivations if <b>technological diffusion</b> and <b>sustainable development</b> are treated as a single, compounding programme rather than separate agendas. This estimate is produced through the <b>Protection Ledger</b>, an accounting model that combines sourced global exposure pools with explicit assumptions about how much of each pool can be closed by 2100 and how much overlap exists between domains.</p><p dir="ltr">The report identifies five domains where protection is technologically and institutionally feasible: <b>energy and clean air</b>, <b>water and sanitation</b>, <b>food and nutrition</b>, <b>income/finance/connectivity</b>, and <b>climate hazard protection</b>.

Together these generate <b>7.1 billion gross protections</b>, which net to <b>~3.0 billion unique people</b> after adjusting for overlap. As the document states: <i>“Because the same person is protected in 2.4 domains on average, that nets to about 3.0 billion unique people.”</i></p><p dir="ltr">Field evidence—from Bangladesh’s cyclone programme, Kenya’s mobile money, India’s LPG rollout, Gavi’s immunisation system, and Africa’s solar uptake—demonstrates that diffusion works when paired with institutions, finance, and maintenance.