the Authority should stick to its original figure. In October 2010, a parliamentary inquiry into the economic impacts of the plan was announced. While, in November 2010, the Authority announced that it might be forced to push back the release of its final plan for the river system until early 2012. Less than one month later, Mike Taylor, then Chair of MDBA, announced his decision to resign effective from the end of January 2011. In announcing his resignation, he cited his concerns that the Water Act made it difficult to balance the environmental and socio-economic impacts of cuts to water allocations aimed at rescuing rivers in the basin. Of crucial concern was Taylor's desire to not oversee a process that returned less than 3,000 GL to the basin. Both the Prime Minister, Julia Gillard, and the Water Minister, Tony Burke, rejected Taylor's concerns that the Water Act and the objectives of the Authority were compromised. In May 2011, the Wentworth Group of Concerned Scientists withdrew its support for the Basin Plan, and described the process as seriously flawed and a waste of taxpayers' money. The Wentworth Group said they could not support the Plan which they believed would cost billions and claimed that it would not fix the problems in the river system. The Wentworth Group wanted a minimum 4,000 gigalitres of water returned to the river system but the Group believed that it would not happen under the draft plan. Water buybacks In June 2011, a federal parliamentary committee (chaired by independent Tony Windsor) delivered its report to MDBA and its recommendations on water cutbacks in the basin. The committee was told river communities faced annihilation if 4,000 gigalitres was returned to the environment. The committee also reported that the health of the river system could be protected without the cuts. The Australian Conservation Foundation said it was disappointed by the report delivered by the inquiry into the Murray–Darling river system. The Foundation believed that buybacks were the most efficient way to save the basin. According to the Wentworth Group, the Commonwealth Government originally planned to start buying the 2,750 gigalitres of water and to increase groundwater extractions by 2,600 gigalitres at the same time in March 2011. Much of the groundwater is linked to river systems, but the Plan does not count it in the models.: In late May 2012, a revision of the plan was forwarded to