Boston Globe: Lights on the famous Citgo sign, Zakim Bridge, Prudential Center, John Hancock Tower, and other local landmarks will “go dark” for one hour this month as Boston joins cities across the world in a climate-change campaign. More than 1,000 cities in 80 countries are expected to participate in Earth Hour on March 28, from 8:30 to 9:30 p.m. World Wildlife Fund, the event’s sponsor, is asking individuals, businesses, governments, and organizations to turn off their lights for one hour to …