Taking cues from progressive cities around the world, including Los Angeles, New York, Toronto, Oslo, Shenzhen, and Sydney, this book is a summons to every city to make small but significant changes that can drastically reduce our carbon footprint. We cannot wait for national governments to agree on how to reduce greenhouse gas emissions and manage the average temperature rise to within 1.5 degrees. David Miller argues that cities are taking action on climate change because they can - and because they must. Miller makes a clear-eyed and compelling case that, if replicated at pace and scale, the actions of leading global cities point the way to creating a more sustainable planet.