To meet the climate challenge, city leaders are committing to ambitious emissions targets, designing decentralized action plans, and sharing lessons in transnational networks. Since growing cities are a large source of global emissions, their efforts could contribute substantially to global climate objectives. As the world’s climate experts gather next week in Bonn, Germany, for the 23rd Conference of the Parties (COP-23), urban initiatives will be a key focal point of the agenda-setting conversation.

As the climate changes, cities will suffer. “These are important places that have a lot of people, property, and local economies that are going to struggle,” said Jessica Grannis, the adaptation program manager at Georgetown’s Climate Center, at a recent Wilson Center event on the role of subnational decision-makers in achieving international goals.  “The good news is that, here in the United States, many cities are recognizing these threats to their people and populations, and they’re beginning to take action,” said Grannis.

In 2011, a group of Hong Kong water activists and researchers traveled the length of the Dongjiang (East) River, which stretches from northeast Guangdong Province into Hong Kong’s New Territories, to investigate the challenges facing the watershed. The Dongjiang basin, which provides nearly 80 percent of Hong Kong’s water supply, has suffered water shortages due to the region’s increasing urbanization and industrialization. They found unchecked wastewater discharges—from agriculture, poultry farms, chemical plants, tanneries, and even an open-air quartz quarry—were dangerously degrading  water quality.

In 2015, Bangladesh’s Prime Minister Sheikh Hasina received the United Nations Champion of the Earth award for her “outstanding leadership on the frontline of climate change.” One of the world’s most populated countries, Bangladesh is also one of the least developed and most vulnerable to climate change. While Bangladesh is well-known for the natural calamities that regularly leave millions of people homeless and displaced, far fewer know that it is also one of the most proactive countries in the fields of disaster risk reduction (DRR) and climate adaptation, as well as a leading voice among the poorest countries in climate negotiations.

At the G20 Summit in Hamburg early July 2017, leaders of the world’s strongest economies issued a joint statement reaffirming their commitment to the Paris Climate Accord. President Trump—the lone outsider—had announced in early June he would withdraw the United States from the agreement. As China doubles down on meeting its Paris targets, the chasm between the world’s two largest emitters and energy consumers continues to widen as previous joint efforts to curb carbon emissions fade away. Post-summit headlines focusing on the “G19” nations suggest America has abandoned international cooperation against climate change. But some U.S. cities and states are continuing the climate fight with their Chinese counterparts.

The idea of an insurance pool to address damage from rising sea levels started in 1991 as mere whispers, but by 2015 it grew to become Article 8 of the Paris Agreement. In Climate Change Loss and Damage, Julia Kreienkamp and Lisa Vanhala explore the history of loss and damage in international negotiations and the prospect of its future. One of the more contentious topics in climate negotiations, loss and damage confronts the culpability of wealthy states for the unavoidable consequences of climate change in more vulnerable, non-Western countries. According to Kreienkamp and Vanhala, “the urgency of the issue for developing countries will rise in inverse proportion to how much action is undertaken to mitigate and adapt to climate change.”

Unless you are cocooned in a tourist bubble, it is hardly possible to miss God when you visit the Pacific Islands. In every village and on every main street there seems to be a church or temple, packed to bursting point on holy days. It is testament to the considerable influence of spirituality on the way people live in the Pacific.