Over the last 30 years man-made CFCs have been the main cause of stratospheric ozone depletion. CFCs however, are not the only ozone-depleting chemicals. Other ODCs include the methylhalides, carbon tetrachloride (CCl4), carbon tetrafluoride (CF4), and the halons which contain bromine instead of chlorine.
Part of the Internet applications glossary: Yahoo! is an Internet portal that incorporates a search engine and a directory of World Wide Web sites organized in a hierarchy of topic categories.
The Company focuses on informing, connecting and entertaining its users with its search (Yahoo search), communications, including Yahoo Mail and Yahoo Messenger, and digital content products, including Tumblr, and its four verticals, such as Yahoo News, Yahoo Sports, Yahoo Finance and Yahoo Lifestyle.