Based on what is generally known about people thought to be drinking more than they should, I don't think there is any way for you to stop him. He, himself, has to be the one to want to stop.\
One question you need to have the answer to first is whether or not he's an alcoholic and someone who would have trouble eliminating some or all of the drinks; or whether he's not an alcoholic and is just drinking more than is healthy (or even more than you believe is healthy).
If he's an alcoholic he needs to get help from someone who deals with alcoholism. If he's not, and he just drinks more than he should (or more than you think he should), I don't think you can do much than look online for information about possible detrimental health (and other) effects of alcohol, print it out, and ask him to read it.
Another question to consider is what I've mentioned above: Does he really drink so much that there may be a serious concern for the health effects, or are you someone who doesn't like alcohol at all and who wishes he would stop drinking altogether?
I'm sorry if this isn't much of an answer, and there's no doubt that people are generally better off not drinking (although wine has been shown to sometimes be beneficial in preventing some potential heart problems in men), but there is no simple answer to this question, which just has too many variables to answer adequately.