Sen. John McCain has signed a letter for the Environmental Defense Action Fund, in which the Arizona Republican emphasizes the group's support for his bill that aims to place "the first-ever national cap on global warming pollution." Mr. McCain, in his letter, mentions no specific type of "pollution," although carbon dioxide has been the main target of anti-global-warming lobbyists. Carbon dioxide is produced in large part by human breathing and cattle flatulence. The Environmental Defense Action Fund sent out the mailing, including Mr. McCain's letter, in which it asked for contributions and for recipients to sign and mail a prewritten...