The government of United Kingdom has been urged to stop the sale of UK Green Investment Bank PLC to Macquarie Group Limited (ASX:MQG), amid concerns the assets will be stripped and its environmental purpose abandoned, The Guardian has reported. Representatives from across different parties raised concerns about the proposed sale, while Caroline Lucas, co-leader of the Green party, argued that the whole process should be stopped. However Nick Hurd, an energy minister, insisted independent trustees would have a special share to safeguard the bank's environmental purpose under its new ownership. 'It is precisely because we want the Green Investment Bank to be able to do more, unfettered from the constraints of the state, that we are seeking to put it into the private sector,' he said. 'Potential bidders are interested in the Green Investment Bank precisely because of its green specialism. We are asking potential investors to confirm their commitment to Green Investment Bank's green values and investment principles and how they propose to protect them, as part of their bids for the company,' Hurd said, adding: 'In addition, the government has approved the creation of a special share, held by independent trustees to protect Green Investment Bank's green purposes in future. The sale is commercially sensitive, so I cannot comment on the identity of any bidders or the discussions taking place between the government and potential bidders.'