There doesn't appear to be any smoking gun so far regarding the thousands of e-mails and documents stolen by computer hackers from the Climatic Research Unit in England — contrary to the conspiracy claims of some global warming skeptics. But some of the documents are embarrassing and troubling, showing petty disputes and grudges between scientists. And the controversy could increase doubts among the public about global warming. Though Americans overwhelmingly believe that global warming is happening, the percentage of believers has dropped from 80 to 72 percent in the past year, according to a new Washington Post-ABC News poll. Most of that drop is among Republicans, whose belief in global warming went from 76 to 54 percent. Americans still support cap-and-trade legislation to help combat global warming by 53 to 42 percent, according to the poll.