Piketty Report: Tax Billionaires, Cap Warming at 1.8°C
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- The World Inequality Lab published the "Global Justice Report," co-authored by 45 authors and built on databases from more than 200 researchers, arguing humanity can keep warming below 2°C while raising living standards and reducing inequality.
- The report's policy mix — billionaire wealth taxes, cutting average annual working time from 2,100 to 1,000 hours (roughly a two-and-a-half-day workweek), reduced red-meat consumption, and a sectoral shift from industry and mining to education and health — would double incomes for 89% of the world's population by 2100.
- Billionaires' share of global wealth would fall from 6% to 0.05% under the plan, while the bottom 50% would see their share rise from 2% to 30%, financed by a global justice fund that would raise education and healthcare spending to 38% of world GDP from 13% today.
- The most ambitious decarbonization pathway in the report would keep warming to 1.8°C by 2100 — better than the 1.9°C projected under a degrowth scenario and far better than the 4°C to 4.5°C under business-as-usual — by redirecting capital from the wealthy into wind, solar, and full electrification of energy by 2050.
- Thomas Piketty, co-director of the WIL and a professor at the Paris School of Economics, framed the report as a deliberate alternative to both degrowth and the ideology of "Trump and all the little Trumps" in Europe, positioning cooperative redistribution as a "third way."
- Piketty warned that environmental policy divorced from inequality is politically doomed, citing France's yellow vest protests against a carbon tax that would have hit workers harder than the rich; the report will be presented at the World Inequality Conference in Paris on 4–6 June.
- Education spending would more than double to €8,400 per person and healthcare to €14,400, with Piketty arguing that "one extra euro of GDP in education and health has three to four times less material footprint" than the same euro in manufacturing.
Why it matters: The report stakes out a distinct political middle ground between degrowth and far-right extractivism, backed by hard numbers: 89% of humanity doubles income, billionaire wealth share drops from 6% to 0.05%, and warming caps at 1.8°C versus a 4–4.5°C business-as-usual scenario. The yellow vest lesson is the practical pitch — Piketty argues green policy without redistribution collapses politically, so the plan couples climate and inequality as inseparable.
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