Jackson believes the package should have included much stronger signals that the UK is serious about renewable energy. "This was a unique opportunity to restructure investment towards a more sustainable economy," he says. "The government must rethink its commitment to a green stimulus package that will be worthy of the name." Most of the £535m that has been allocated to green projects is not even new money, but has simply been brought forward from next year's budget - meaning that it will be offset by spending cuts in future years.