The Pre-school Learning Alliance is one of a number of organisations to have criticised the plans.

BBC: Huge and angry response to childcare plans, says charity

The warning comes after the Pre-School Learning Alliance condemned the planned changes at a conference on childcare.

BBC: Childcare ratios 'could hit nurseries in poor areas'

The Preschool Learning Alliance says its members fear such a change would risk children's safety and well-being.

BBC: Cutting nursery staff ratios 'may reduce care quality'

The Preschool Learning Alliance says the government funding was never enough, so nurseries had to subsidise the free places themselves.

BBC: Cutting nursery staff ratios 'may reduce care quality'

The Pre-School Learning Alliance says that more than 11, 000 parents have signed a petition against the changes to childcare ratios in England.

BBC: Huge and angry response to childcare plans, says charity

The recovery has brought a cautious welcome from the Pre-School Learning Alliance - particularly now that the education secretary is becoming directly involved.

BBC: Chasing pre-school targets

Neil Leitch, of the Pre-School Learning Alliance charity, said he was pleased the prime minister was prepared to compromise but the current "ill-considered" proposal should be scrapped altogether.

BBC: Childcare ratios: We will find way forward, says Cameron

As an added bonus to saving school districts money that can be reinvested in other educational resources, energy efficiency efforts provide a valuable hands-on learning experience for students that can strengthen their math, science and communication skills, the alliance reports.

CNN: Energy efficiency urged for schools