An upwards revision to world oil demand means the West will need more oil from the OPEC cartel this year and next than previously thought, the International Energy Agency (IEA) said. IEA reported that the "call on OPEC oil" would be 400,000 barrels per day (bpd) greater this year than it previously forecast, at 27 million bpd. Next year the call on OPEC oil will be 300,000 bpd more than earlier estimates, although the absolute level is expected to sink to 26.8 million bpd in 2002 because of more production expected outside the cartel. The big revision paints a more bullish picture for global oil markets, particularly after OPEC's recent decision to slash output by one million barrels per day from September 1.