The Germany-based group, which owns Thomson Holidays, will launch a dedicated website next week that will detail the firm's work and introduce a ‘Green Standard' for resorts.
The site will assess resorts' water and energy-efficiency and recycling. Hotels reaching the standard will have a logo next to their details in TUI brochures, and the first ‘Green Medal' will be awarded in November.
The website will also have a section aimed at holidaymakers, covering everything from turning off hotel-room lights to appropriate behaviour in Muslim countries.
The campaign is being spearheaded by corporate reputation manager Kimberley Kay, who moved from her head of PR role at Thomsonfly in June.
Kay is also overseeing an internal comms element to the campaign. Staff are being sent on Green Days, where they will be able to talk to aircraft engineers from Boeing and drive hybrid cars.