The UK Energy Research Centre (UKERC) has launched a major new report on how 'Rebound Effects' can result in energy savings falling short of expectations, thereby threatening the success of UK climate policy. An example of a rebound effect would be the driver who replaces a car with a fuel-efficient model, only to take advantage of its cheaper running costs to drive further and more often. Or a family that insulates their loft and puts the money saved on their heating bill towards an overseas holiday.