The Carbon Trust has shortlisted its roster ad agencies McCann Erickson, Tullo Marshall Warren, Tequila and Fishburn Hedges to present ideas for the campaign.
Activity is scheduled to run over June and July in a bid to win business backing for initiatives to lower emissions.
The summer activity is expected to be the organisation's most significant campaign of the year.
It spent £4 million on advertising in the past year, according to Nielsen Media Research.
Media buying for the campaign will be through Universal McCann, which is contracted as the Carbon Trust's buying agency until 2007.
Peter Hambly, the director of marketing and communications at the Carbon Trust, said: "We are trying to reach businesses and raise awareness of carbon emissions and get more companies to sign up to our initiatives."
Two years ago, the Carbon Trust appointed McCann Erickson Business as its lead agency. However, it pitches out large projects to roster agencies under European Union regulations.
Past activity includes a press and poster campaign featuring businesses that back the Carbon Trust under the strapline: "Smart companies." It featured corporations including Asda, Heinz, Scottish & Newcastle and Sainsbury's.