Yahoo! is working hard to promote energy efficiency both inside and outside the office. In February, 2008, Yahoo! installed an interactive 'Green Screen' at their headquarters to increase awareness and allow employees to compare energy use between buildings. Externally, Yahoo! continues to reach out to its community of over 500 million users to promote energy efficiency. In February, 2007, Yahoo! helped launch a site designed to encourage consumers to switch to CFLs. Other sites, such as the annual Earth Day site, Yahoo! Green, Yahoo! Answers, and the Yahoo! Green Holiday Gift Guide, offer comprehensive information, including tips, news, and ways to take action, which to help users reduce their carbon footprints and save energy. Yahoo! also continues to practice what they preach, upholding their 2007 pledge to remain carbon neutral.