By day tourists flock to the Plaza de España in central Madrid to snap photos beside the sculpture of Miguel de Cervantes, author of "Don Quixote."
By night a newer facet of Spanish culture is on display: loitering groups of young people downing plastic bottles of whiskey and vodka mixed with Fanta Lemon carbonated juice. The ground is littered with empties. Nearby, three young men help a friend who's vomiting on the pavement.
Such carousing was once rare in Spain. A Mediterranean drinking culture prevailed in which alcohol was taken only with food. That is changing. In Spain and many other rich countries, alcohol intake is becoming a bigger problem — for some groups.
Overall, global consumption of alcohol has been stable since 1990, according to the World Health Organization. Around half of the planet's population is teetotal. But those who drink alcohol are doing so more hazardously. Policymakers are looking for ways to address this. A new and much-watched experiment in Scotland, for example, involves setting a minimum price for each unit of alcohol.
Individual consumption peaked in Spain in 1975, but young people are increasingly indulging in the botellón, (literally "big bottle"): Drinking outdoors to get drunk. In France, another country with traditionally moderate drinking patterns, a similar trend is emerging. In the past three years hospital admissions from alcohol abuse have risen 30 percent there, to 400,000 a year. Binge drinking is so common that in July it gained an official name, "beuverie express." Across much of the rich world, many people (not just the young) are drinking greater quantities in a single session.
Responsible drinkers pose little risk to others. But the growth in hazardous drinking habits has far-reaching implications. Deaths from the overuse of alcohol rose from 750,000 in 1990 to 2.5 million in 2011, nearly 4 percent of all fatalities worldwide. Alcohol causes long-term ill-health, but even a single binge can end in hospital: In Britain, for example, such admissions doubled in 2003-10.
It is not only drunks who suffer from their excess. Booze contributes to a third of all deaths on Europe's roads each year and stokes abuse and violence. It features in almost all public-order offenses in Ireland; Up to 80 percent of Australian police work is alcohol- and drug-related; across the European Union, it is linked to 65 percent of domestic violence and 40 percent of murders. When lower economic output and higher social costs are taken into account, alcohol costs Europe and America hundreds of billions a year, up to 1.5 percent of GDP by some estimates.
The alcohol industry has introduced some modest schemes to encourage responsible drinking. Governments have stepped up education campaigns; most restrict the sale of alcohol in some regard, by licensing premises, setting opening and closing hours and banning purchases by children. But all that is largely outweighed by another factor: Health campaigners say that in many countries booze is simply too cheap.