Tequila\ retained the business after a pitch against MRM Worldwide, Miller Bainbridge and WDMP.
The agency has been the incumbent on both accounts since April 2007.
The Carbon Trust is a government-funded independ-ent company that was formed in 2001 to encourage people to reduce the carbon emissions that they produce.
Tequila\ has created a number of campaigns for the company in the past two years, including a DM, press, experiential and online campaign centred around the brand's "get ready for the low carbon economy" slogan.
The work targeted businesses encouraging them to reduce their energy bills by being more careful in regulating their carbon emissions. The campaign picked up a Direct Marketing Association bronze award.