AMSTERDAM, March 20 (Reuters) - A Dutch court ruled on

Wednesday that KLM misled customers with an advertising campaign

aimed at improving the company's environmental image, in a case

of so-called "greenwashing".

The decision is an important symbolic victory for

environmentalists who said the company's "Fly Responsibly"

campaign was misleading given that all aviation is an important

source of greenhouse gas emissions.

"A number of advertisements made by KLM in the past were

misleading and therefore illegal," the court said in a summary

of the judge's written decision.

However the company will not be forced to issue any

rectification, and it may continue to advertise to customers. In

the future, the firm must be "honest and concrete" about

environmental claims, the court said.