Only five months later did the Government produce revised figures to show that, with the new target, the benefits would now be nearly ten times greater than its original estimate, at over £1 trillion - while the costs had now only doubled, to a total over 40 years of up to £734 billion (or £18 billion a year). The MPs had of course not known this when they voted for the amended Bill but at least the Government now had figures showing that the benefits exceeded the costs. Even so, short of some unimaginable technological revolution, such a target could not possibly be achieved without shutting down almost the whole of our industrialised economy, changing our way of life out of recognition.