The United States has nearly 100,000 miles of coastline and much of it is at risk of flooding. But what that inundation looks like varies widely from place to place. From storm surges to land subsidence, the latest Backgrounder details the different types of flooding and the threats they pose to coastal communities, especially sea level cities.

Recent urban-interface infernos, fueled by climate change, leave no doubt that we have entered the age of runaway fire. Writer and ecologist Lauren Oakes writes that large-scale combustion is permanently reshaping ecosystems and societies as we learn to live with wildfire, not just fight it. Instead of perpetuating problematic approaches to forest management, experts call for confronting the root causes of this crisis and adopting science-informed responses.

With wildfires becoming more extreme in every way, reporters covering them face new challenges along with familiar hazards. A pair of experienced wildfire journalists and others on the front lines offer advice on dealing with access restrictions, on-the-ground dangers, toxic exposure risks and traumatized survivors — as climate change speeds up the news cycle and misinformation muddies the reporting landscape.

As trade wars loom with U.S. allies, including our neighbors to the north and south, another kind of long-standing relationship is under threat — the environmental partnership between the United States and Canada. A Backgrounder Analysis examines deep-rooted ties over energy, water and timber. Does the brewing conflict over trade mean the long bonds over the environment have been broken?