A crowd of people walking through a railway station passage, photographed in black and white

The Global Justice Report

A Plan for Equality & Prosperity Within Planetary Boundaries

Content & data: WID (2026)

Interactive design study · SandraViz

Ensuring Equality and Prosperity for All

The Global Justice Report attempts to set out a new vision for global progress in the 21st century: grounding human development and equality in planetary habitability. It explores the conditions under which the world could move toward this horizon and traces an economically and ecologically consistent transition path from 2026 to 2100.

Its main conclusion is simple: it is possible to reconcile planetary habitability and high well-being for all, but only if the transformation rests on three pillars simultaneously. Fast decarbonization of energy systems is necessary. But we also need a major shift toward sufficiency – understood as a sharp reduction in labour hours and material footprint and large changes in consumption patterns, food habits, land use, and forest cover. In addition, neither decarbonization nor sufficiency can be financed and politically sustained without a drastic reduction in inequality of income, wealth and power, both between countries and within them. The compression of global inequality is not only compatible with deep decarbonization; it is a necessary condition for shared prosperity on a finite planet.

The Global Justice Report is the first attempt to propose a fully quantified plan going in this direction, combining four dimensions that today's debates often treat separately: redistribution at the world scale, a deep reform of the international financial and economic order, a radical transformation of energy systems, and substantial shifts in consumption patterns. Compared to most climate scenarios, including by the Intergovernmental Panel on Climate Change (IPCC), the main novelty is that we model all four dimensions together and place inequality and sufficiency at the center of the analysis.

Figure 1
Large Gaps in Average Monthly Income Between Regions
Monthly Gross National Disposable Income, 2025 Euros PPP
Sources & series: gjp.wid.world (F1)
sandraviz.com

Working Less, Achieving Gender Equality

The first element of sufficiency in the Global Justice Platform is a large reduction in working hours: from about 2,100 hours to 1,000 hours per year per employed person, between 2025 and 2100 (Figure 2). As observed in historical episodes of working-time reduction, productivity growth makes such reductions possible.

Figure 2
Using Productivity Gains to Reduce Work Hours
Average Annual Labour Hours per Employed Individual, 1800–2100
World
Regions
Sources & series: gjp.wid.world (F2)
sandraviz.com

Compressing the Income and Wealth Scale

The Global Justice Platform aims at substantial compression of national income and wealth scales over 2026-2100. Global wealth and income taxes are designed both to raise the resources needed by the Global Justice Fund and to curb the concentration of income, wealth, and power at the top of the world distribution.

Figure 13
The Top 10% Share Has Swung Widely, and Is Set to Shrink
Global Income Shares in Post-Tax Income, 1800–2100
Sources & series: gjp.wid.world (F13)
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Figure 13
The Middle 40% Holds Roughly Steady
Global Income Shares in Post-Tax Income, 1800–2100
Sources & series: gjp.wid.world (F13)
sandraviz.com
Figure 13
The Bottom 50% Overtakes the Top 10% Around 2050
Global Income Shares in Post-Tax Income, 1800–2100
Sources & series: gjp.wid.world (F13)
sandraviz.com