The Presidential Office, along with other government agencies, will switch off its lights at 8: 30 p.m. on Saturday for one hour as part of a global 'Earth Hour' campaign in more than 120 countries. Wu Chia-ling, an executive of the Society of Wilderness that is leading the carbon-reduction drive in Taiwan, said apart from the government sector, the private sector, including prominent buildings in Taipei City such as the 101 Tower, Grand Hyatt Taipei hotel and NEO19, will also take part in the activity. According to Wu, the one hour lights-out campaign in Taiwan will save between 250,000 and 280,000 kilowatt-hours of electricity, which is equivalent to cutting 170 tons of CO2 emissions. Hundreds of thousands of private individuals will also take to the streets in eastern Taipei City Saturday afternoon in a show of support for the campaign, she said. Using small LED lamps, they will form a pattern to depict Taiwan's resolve to reduce greenhouse emission, she added. So far, more than 1,200 people have registered to participate in the street activity, and some 170,000 have indicated their support for the campaign via the Internet, Wu said. 