The article discusses different views on how much oil is left in the world and when we might run out. The researchers used a model to predict when oil production will start to decline in different regions. They found that oil production outside the Middle East is likely to peak between 2010 and 2030. Total world oil production is expected to peak between 2020 and 2050. After that, we will need to rely on other sources like oil sands and heavy oil to meet our energy needs.