By 2030, nearly half a billion teenagers worldwide will suffer from obesity or being overweight, and 1 billion will be at risk of preventable diseases, according to a report by the Lancet Commission on Adolescent Health and Wellbeing.

While teen mortality has fallen by more than a quarter in the past two decades, a comprehensive analysis of global data shows that within five years, at least half of the world’s 10-24-year-olds will be living in countries where health problems, particularly HIV/AIDS and early pregnancy, are preventable. Depression and poor nutrition are a daily threat to their health, wellbeing, and life chances.

The authors of the aforesaid report warn that young people’s health is at a “tipping point.” By 2030, a total of 464 million young people will be obese or overweight—143 million more than in 2015.

The report notes as well a considerable deterioration in young people’s mental health, and says the climate crisis poses considerable new risks to adolescent health.