HONG KONG — The island of Guam made rare headlines this week when North Korea, responding to blustery language from President Trump, threatened to fire four ballistic missiles into waters near the American territory’s shores. Some Guam residents told reporters that they worried what might happen if North Korea’s leader, Kim Jong-un, were actually to follow through.

Scientists in Guam, however, say they have at least one other major threat in mind: climate change.

“We know that it’s serious,” said Austin J. Shelton III, a marine biologist and the executive director of the Center for Island Sustainability at the University of Guam. “Some of the impacts are here, and a lot more are coming.”