But if the trend is reversed, the Jewish people could grow by 4 million people in the same period, they said.
To highlight the difference, the World Jewish Demographic Project leaders pointed out that the difference between the two projections approaches 6 million people - the number of Jews killed in the Nazi Holocaust of World War II, implying that the Jewish people are in danger of reducing their own numbers almost as much as the Nazis did with mass murder.
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Today there are 13.3 million Jews in the world. Instead of a drop of a million, the Jewish population could increase to 17 million by 2050 if trends are reversed just slightly, the experts said.
Now, "the population growth is about zero percent," said Natan Sharansky, a Cabinet minister and co-chairman of the project. However, he added, "If Jewish fertility will slightly increase or very slightly decline, the difference may in the end mean several million people more or less."
Sharansky and leaders of the quasi-government Jewish Agency that oversees immigration to Israel urged the government to invest money abroad in Jewish education to encourage Jews to marry other Jews, raise their children as Jews and move to the Jewish state.
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As an example, about 80 percent of 20-year-old Jewish Russians marry non-Jewish partners, according to 1994 figures. Most often, the children of mixed marriages do not choose to be Jews, said Sergio DellaPergola, a professor who compiled a survey on Jewish demographics as part of the study.
Only by 2050 can the Jewish people hope to approach the number of Jews lost in the Holocaust. There were 18 million Jews in 1939, before the war.
Despite a growth rate among Jews in Israel of about 2.6 percent, assimilation has brought the growth rate abroad so low that it almost cancels out the increase in Israel, DellaPergola said.
Although the Sept. 11 terrorist attacks in the United States have not yet led to an increase in the number of American Jews immigrating to Israel, they did raise their level of Jewish identification with Israel, Sharansky said.