The trust, which was set up by the government to reduce carbon emissions, appointed a four-strong media buying roster in January, comprising Manning Gottlieb OMD and Brilliant Media.
After a further two-stage procurement process, it has now awarded all online and outdoor duties to Carat, and TV, press, radio, cinema and sponsorship duties to Universal McCann.
Worth a combined £12m over the year, the contracts include the option of extension for a further 12 months.
The aim of the activity is to raise the profile of the trust and promote the services it provides.
Earlier this month, Vallance Carruthers Coleman Priest won the creative brief, ahead of the trust's other roster agencies WCRS and Rainey Kelly Campbell Roalfe Y&R.
Peter Hambly, director of marketing and communications at the Carbon Trust, said: "The issue of climate change is top of the agenda for business and consumers today which holds some exciting challenges and opportunities for the Carbon Trust and our delivery partners."
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