Rising heat linked to suicide spikes in US, Mexico

LONDON: A hotter planet could lead to tens of thousands more suicides by 2050 in the United States and Mexico alone, unless global warming is curbed, according to a study published on Monday.

Researchers examined decades worth of temperature data against suicide rates in US counties and Mexican municipalities, some dating back to the 1960s, and found that hotter weather was linked to increases in deaths by suicide.

“Hotter temperatures are clearly not the only, nor the most important, risk factor for suicide,” lead author Marshall Burke, an economist at Stanford University, said in a statement.

“But our findings suggest that warming can have a surprisingly large impact on suicide risk, and this matters for both our understanding of mental health as well as for what we should expect as temperatures continue to warm,” he said. According to their analysis, a 1 degree Celsius (1.8 degrees Fahrenheit) increase in average monthly temperature led to a 0.7-per cent rise in suicide rates in the US, and a 2.1-per cent rise in Mexico. The paper, published in the journal Nature Climate Change, also analysed the language used in over half a billion Twitter posts and found that suicide rates and depressive language increased during hot weather.

The study projected that if global warming is not capped by 2050, there could be at least an additional 21,000 suicides in the two countries alone.

Suicide rates rose in nearly every US state from 1999 to 2016, with the rate spiking by more than 30 per cent in half of the country, the Centers for Disease Control and Prevention reported in June.

Nearly 45,000 people committed suicide in 2016, making it one of three leading causes of death on the rise in the US, along with Alzheimer’s disease and drug overdoses. “When talking about climate change, it’s often easy to think in abstractions,” said Burke, of Stanford University.