The approval of a number of sites earmarked by the government for eco-home developments may risk not being approved, it has emerged.Launching the second stage of the eco-town consultation process, the housing minister Margaret Beckett has said that she did not anticipate that the twelve sites which had been selected would be passed in their entirety.Ms Beckett said I believe it is vital we get the locations for these eco-towns right, and the shortlist has been refined to reflect the results of the most detailed assessment to date on these potential locations.However, she added that the expectations of the scheme were high I do not expect all of these locations to go forward - the eco-town standards are tough and I think some of these shortlisted schemes could struggle to meet them.Everyone has the opportunity to have their say on these proposals, both now and in the future when planning applications are received.The governments eco-towns initiative, under the remit of the Department for Communities and Local Government, aims to establish 20,000 new homes.