The upcoming UN climate summit in Glasgow, Scotland, will be the most important conference since the one in Paris in 2015. The Paris Agreement on Climate Change inspired the hope that humankind, in global cooperation, can avert further disaster. The climate crisis has kept escalating, however, as the atmosphere’s carbon dioxide concentrations kept rising. We can still prevent the worst. For that to happen, the advanced nations must radically scale up their action. They must also do more to support low-income countries.