Predicting the end of oil has proven tricky and often controversial, but Kuwaiti scientists now say that global oil production will peak in 2014.

Their work represents an updated version of the famous Hubbert model, which correctly predicted in 1956 that U.S. oil reserves would peak within 20 years. Many researchers have since tried using the model to predict when worldwide oil production might peak.

Some have said production already peaked. One earlier model by Swedish researchers suggested that oil would peak sometime between 2008 and 2018. And other researchers have argued there are decades to go before oil production goes into irreversible decline. The only thing they all agree on: Oil is a finite and very valuable resource.

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The scientists from Kuwait University and the Kuwait Oil Company adopted a newer approach by including many Hubbert production cycles, or bell-shaped curves showing the rise and fall of a non-recyclable resource. Earlier models typically assumed just one production cycle, despite the fact that most oil-producing nations have historically experienced more of a roller coaster ride in production.

Such production cycles reflect the influence of new technological innovations in the oil industry, government regulations, economic conditions and political events. The factors include the discovery of new oil deposits, the recent economic recession and the rise of renewable energy.

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The Kuwaiti study created its world model for peak oil based on 47 individual models for each major oil-producing nation. It also took a separate look at the Organization of the Petroleum Exporting Countries (OPEC), which includes nations that control about 35 percent of the world's oil reserves.

More complications may still change the ultimate end date for peak oil. OPEC's latest projection suggests that world oil demand will grow by 900,000 barrels per day in 2010, according to an Associated Press story this week. That follows a period of low oil demand during the height of the worldwide recession in 2009.

For now, Kuwaiti scientists say that the world continues to consume its oil reserves at a rate of about 2.1 percent each year. They plan to continue including new data that can refine the model as time goes by.