European airlines are starting to become prudent when promoting flight carbon-offset measures, such as reforestation, following courtroom losses and stepped-up pressure by regulators.

Dutch airline KLM in March last year lost a case about greenwashing -- a practice in which companies are regarded as claiming to be more environmentally responsible than they really are.

An Amsterdam court ruled it misled consumers with "vague and general" adverts about efforts to reduce the environmental impact of flying, including painting "an overly rosy picture" about the impact of measures such as adopting sustainable aviation fuel.

In March, a German court banned airline giant Lufthansa from saying in its advertisements that passengers could "compensate" for carbon emissions from flights, finding th

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