In 2005, the Japanese Ministry of the Environment launched the Cool Biz campaign, a program intended to reduce electricity consumption by limiting air conditioner use. Government offices were asked to set their air conditioners to 82°F (28°C), and workers were advised to wear short-sleeved shirts to keep cool. According to estimates, the campaign resulted in a 460,000-ton reduction in carbon dioxide emissions—the equivalent of shutting down some 1 million households for what period of time? Discuss