By OLIVIER FENIET / AFPTV / AFP Paris climate activists have found a new way to get across their message against energy waste in the City of Light — switching off store signs and advertising screens that are kept on all night even though the government has urged people to cut back electricity use. Paris climate activists have found a new way to get across their message against energy waste in the City of Light — switching off store signs and advertising screens that are kept on all night even though the government has urged people to cut back electricity use. At 9:00 pm on a recent evening, …