The idea emerged out of the data-sharing review commissioned by Gordon Brown and conducted by the information commissioner Richard Thomas and Dr Mark Walport, the director of the Wellcome Trust.
Wootton, ISBA's media and advertising director, has now raised concern about the proposal's effects in a letter to Carter, the prime minister's chief special adviser and former chief executive of Ofcom.
Wootton wrote: "Losing access to the register would mean direct marketers relying on less accurate source of data and an increasing amount of wrongly addressed mail.
"This would undermine current environmental initiatives and would be at odds with the review's objectives.
"Currently, the register offers a database of high integrity with a very high percentage of robust information, providing marketers with a source of data which is used extensively for database cleaning, thereby ensuring that mailings are effectively targeted and accurately addressed."
Wootton also claimed that a ban on the use of the register might generate difficulties because direct marketers would no longer be able to use it to ensure compliance with the Data Protection Act.