text: The National Center for Policy Analysis is holding a congressional briefing on Earth Day, April 22, on "Global Warming: What do We Really Know vs. What We are Told." Speakers include David Legates of the University of Delaware, Patrick Michaels of the University of Virginia and the Cato Institute, and Alexandra Liddy Bourne of the American Legislative Exchange Council. The event will be held from 10 to 11:30 AM in Room 406 of the Senate Dirksen Office Building. To RSVP or for more information, please call (202) 628-6671 or e-mail mmoore@ncpa.org.