The triple climate inequality crisis, or disparities in contributions, impacts and capacity to act within and between countries, is a central issue in addressing climate change. This Comment advocates for progressive wealth taxation as a viable solution to the finance gap. The climate crisis impacts human societies profoundly, especially in regions with low historical emissions and income levels1,2. Such impacts exacerbate economic disparities within countries, with climate-related losses primarily affecting the economically vulnerable3,4. Research finds that a small fraction of the global population in emerging and high-income countries is responsible for a disproportionate share of greenhouse gas emissions5,6. This group also controls a substantial portion of global wealth and holds the key to effective global climate finance and meaningful adaptation strategies7. Better understanding of the joint distribution of carbon emissions, climate-related losses and capacities to finance the transition is pivotal to accelerating societies' response to climate change.