College presidents from about 100 of the nation’s best-known universities, including Duke, Dartmouth and Ohio State, are calling on lawmakers to consider lowering the drinking age from 21 to 18, saying current laws actually encourage dangerous binge drinking on campus.

The movement called the Amethyst Initiative began quietly recruiting presidents more than a year ago to provoke national debate about the drinking age.

“This is a law that is routinely evaded,” said John McCardell, former president of Middlebury College in Vermont who started the organization. “It is a law that the people at whom it is directed believe is unjust and unfair and discriminatory.”

Other prominent schools in the group include Syracuse, Tufts, Colgate, Kenyon and Morehouse.

But even before the presidents begin the public phase of their efforts, which may include publishing newspaper ads in the coming weeks, they are already facing sharp criticism, including from Robert L. Carothers, president of the University of Rhode Island, who banned alcohol from all events on the Kingston campus in 1995.

“There is already quite a body of science out there that shows that the earlier a person has alcohol, the more likely it is that he or she will abuse alcohol,” said Carothers, who has won national and regional awards for his efforts to curb underage drinking at URI. He said while underage drinking persists at URI, some campus-wide studies have shown binge drinking has decreased by 15 percent to 20 percent over the past decade.

“One of the things I do is travel, talking to college presidents about this issue and I find many of them are simply afraid to take a stand for fear of alienating their students and alumni,” Carothers said. “But that is a really poor excuse for putting the lives of students in jeopardy.”

Mothers Against Drunk Driving says lowering the drinking age would lead to more fatal car crashes. It accuses the presidents of misrepresenting science and looking for an easy way out of an inconvenient problem. MADD officials are even urging parents to think carefully about the safety of colleges whose presidents have signed on.

“It’s very clear the 21-year-old drinking age will not be enforced at those campuses,” said Laura Dean-Mooney, national president of MADD.

Both sides agree alcohol abuse by college students is a huge problem.

Research has found more than 40 percent of college students reported at least one symptom of alcohol abuse or dependence. One study has estimated more than 500,000 full-time students at four-year colleges suffer injuries each year related in some way to drinking, and about 1,700 die in such accidents.

A recent Associated Press analysis of federal records found that 157 college-age people, 18 to 23, drank themselves to death from 1999 through 2005.

Moana Jagasia, a Duke University sophomore from Singapore, where the drinking age is lower, said reducing the age in the United States could be helpful.

“If the age is younger, you’re getting exposed to it at a younger age, and you don’t freak out when you get to campus,” she said

McCardell’s group takes its name from ancient Greece, where the purple gemstone amethyst was widely believed to ward off drunkenness if used in drinking vessels and jewelry. He said college students will drink no matter what, but do so more dangerously when it’s illegal.

The statement the presidents have signed avoids calling explicitly for a younger drinking age. Rather, it seeks “an informed and dispassionate debate” over the issue and the federal highway law that made 21 the de facto national drinking age by denying money to any state that bucks the trend.

But the statement makes clear the signers think the current law isn’t working, citing a “culture of dangerous, clandestine binge-drinking,” and noting that while adults under 21 can vote and enlist in the military, they “are told they are not mature enough to have a beer ”

“I’m not sure where the dialogue will lead, but it’s an important topic to American families and it deserves a straightforward dialogue,” said William Troutt, president of Rhodes College in Memphis, Tenn., who has signed the statement.

But some other college administrators sharply disagree that lowering the drinking age would help. University of Miami President Donna Shalala, who served as secretary of health and human services under President Bill Clinton, declined to sign.

“I remember college campuses when we had 18-year-old drinking ages, and I honestly believe we’ve made some progress,” Shalala said in a telephone interview. “To just shift it back down to the high schools makes no sense at all.”

Carothers says there is another important reason to crack down on drinking: the high correlation of drinking and campus sexual abuse.

“There are a lot of bad things that happen when young people are exposed to alcohol, and part of it is that young people have a poor ability to assess risks,” Carothers said. “You can never eliminate this abuse, and the hard part for everyone is that you have to start over again every September and establish those values again with a new freshman class.”