The orginal intent of Daylight Savings Time was to reduce evening usage of incandescent lighting. Although energy conservation remains an important goal energy usage patterns have changed since then and no significant savings is found today. Several studies have suggested that DST increases motor fuel consumption, which is bad for our environment. Changing clocks and DST rules has a direct economic cost, entailing extra work to support remote meetings, computer applications and the like. For example, a 2007 North American rule change cost an estimated $500 million to $1 billion. There is no difference in traffic fatalities. A 2009 study found on Mondays after switching to DST, workers sleep an average of 40 minutes less, and are injured at work more often and more severely.



