Extreme heat and sea levels are typically monitored and studied individually but researchers from Hong Kong Polytechnic University found they were occurring simultaneously—a phenomenon that could multiply fivefold by mid-century.

The study’s lead author, Mo Zhao, told AFP these events pose “very dangerous” risks, from deadly heat to floods, that may “exceed the coping capacity” of communities to respond.

“We don’t have sufficient resources or sufficient human resources to handle these two extremes,” she said.