· Decline in gas, coal and uranium also predicted
"The world soon will not be able to produce all the oil it needs as demand is rising while supply is falling. This is a huge problem for the world economy," said Hans-Josef Fell, EWG's founder and the German MP behind the country's successful support system for renewable energy.
The report's author, Joerg Schindler, said its most alarming finding was the steep decline in oil production after its peak, which he says is now behind us.
The results are in contrast to projections from the International Energy Agency, which says there is little reason to worry about oil supplies at the moment.
However, the EWG study relies more on actual oil production data which, it says, are more reliable than estimates of reserves still in the ground. The group says official industry estimates put global reserves at about 1.255 gigabarrels - equivalent to 42 years' supply at current consumption rates. But it thinks the figure is only about two thirds of that.
Britain's oil production peaked in 1999 and has already dropped by half to about 1.6 million barrels a day.
