Any reasonable step we can take to use less energy is a plus.
How does adjusting hours save energy?? 
The idea that since we've largely become so dependent on the clock instead of the sun to regulate our lives to adjust the clock so that more hours of daylight occur when we are awake, thereby saving energy on lighting and to a lesser degree heating.
For those of us in the south other than being an inconvenience, Daylight Savings doesn't accomplish much, but in a place such as Philadelphia, home of Benjamin Franklin, to whom DST proponents like to attribute this idea, it makes more sense since in the summer they have about three months summer in which the sun rises before 5am, standard time.
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