A pointed argument that cities – not nation-states – can and must take the lead in fighting climate change Climate change is the most urgent challenge we face in an interdependent world where independent nations have grown increasingly unable to coo...

In the face of the most perilous challenges of our time – climate change, terrorism, poverty, and trafficking of drugs, guns and people – the nations of the world seem paralyzed. The problems are too big, too interdependent, too divisive for the nati...