The Carbon Trust has played down criticism of its carbon footprint label and revealed that six more major grocery brands are to sign up to the scheme.
Last month The Grocer reported how Procter & Gamble had rejected the label because it was "too complicated for consumers".
But Ewan Murray, Carbon Trust strategy manager, said other companies were clamouring to get on board.
"We have been inundated with interest," he said. "This support is underpinned by the backing we've had from the BSI British Standards and Defra."
Cadbury Schweppes, Müller, Scottish & Newcastle, Kimberly-Clark, The Co-operative Group and Coca-Cola have now joined the scheme, as have three companies from outside the grocery industry, said Murray.
They were selected from 150 applicants, he claimed.