With the world overheating, glaciers melting, and landscapes in flames, it’s difficult to think of a harder or more important job than John Kerry’s. The former senator and Secretary of State is now the special Presidential envoy for climate, a Cabinet-level post created by President Biden. Kerry talks with David Remnick about reasserting the United States’ fitness to lead on global climate action in the wake of Trump Administration policies, and about how to get allies and adversaries to engage in the battle together. He is heading to Glasgow for talks that aim to hold the warming level to 1.5 degrees Celsius. “Imagine what happens at 1.5, if you already see what’s happening at 1.2,” Kerry exclaims. “Is that what we want? You would think not!”