World Wildlife Fund is asking everyone to turn off all non-essential lights tonight between 8:30-9:30 p.m. It's called , "Earth Hour". This one act will save energy dollars and help the environment. So simple.
Go one step farther. During the hour, read a book by candlelight or play cards. What about having a romantic dinner or dessert by candlelight. The moon is still quite large and bright in the evening sky - you could take a walk around your neighborhood. Lots to do and it costs nothing.