WASHINGTON - A new study says one of the few benefits of global warming - fewer deaths from the combination of extreme heat and cold - may eventually melt away in Europe.

For years, scientists have predicted global warming will lead to fewer temperature-related deaths. The increase in the number of deaths related to hot summers, they have thought, will be more than offset by a reduced number of deaths in milder winters.

But a new study in Europe finds that by about 2040, the increase in heat deaths will likely outweigh the reduction in cold deaths. The study suggests that by 2070, global warming may cause 15,000 more temperature-related deaths a year in Europe, which has less air conditioning than the United States.

The study released on Tuesday by Nature Communications looks only at deaths from heat and cold, not increases from flooding, droughts and storms. It used computer models to analyze the climate under global warming and compares that to death rates in 200 separate regions of Europe.

The study's chief author, Joan Ballester, a climatologist at the Catalan Institute of Climate Sciences in Barcelona, said the same death assumptions cannot be made for other continents.

Jonathan Patz, director of the Global Health Institute at the University of Wisconsin, said there seems to be fewer cold-related deaths in the United States than in Europe. That may mean that the US will see heat deaths outweigh cold deaths sooner than Europe does, he said. Other experts say air conditioning in the US is a big factor, so that scenario is unlikely.

Overall, the decreases in European temperature-related deaths "are going to be clearly lower than what was expected", Ballester said.

Ballester's calculations show that starting around 2025, Europe will probably have the fewest temperature-related deaths in recent time, about 11,000 a year fewer than now. But then it increases back to current levels and by 2070, total temperature-related deaths will likely be higher.

Some places in Europe will suffer more than others, Ballester calculates. Figures show that southern Europe, especially Italy, will suffer larger increases in heat deaths while overall temperature mortality will continue to fall in northern places like the United Kingdom and parts of Scandinavia.

Patz, who wasn't part of the study, said Ballester's work "is really an essential paper in the field of climate change and health".

Associated Press