Increasingly complex, growing and related risks, from global warming to pollution and epidemics, threaten human survival if left to escalate, the United Nations warned on Wednesday.
A biennial assessment report on how the world is dealing with disasters said the past could no longer be relied on as a guide to the future, with new risks emerging "in a way that we have not anticipated."
It identified a range of major threats to human life and property, including air pollution, diseases, earthquakes, drought and climate change.