DUBLIN: Irish-headquartered budget airline Ryanair has refused to accept a ruling from the UK's Advertising Standards Authority over a press campaign it ran on aviation's contribution to global warming.

The ASA says the ad, which claimed the airline industry accounted for "just 2% of CO2 emissions", breached rules relating to truthfulness.

Ryanair was ordered not to use it again but the airline has refused to accept the judgement because, it claims, the ASA is trying to suppress an accurate statement.

The watchdog launched its investigation after receiving 34 complaints. It is the second time this year Ryanair has come under its scrutiny.

In January the company conceded a claim that it had cut its CO2 emissions by half in recent years was "a mistake".

Data sourced from BBC Online; additional content by WARC staff