UPI: Rising carbon dioxide in the atmosphere may threaten climate change and be bad news for humans but poison ivy likes it, U.S. researchers say. A report in the journal Environmental Health Perspectives last year said the amount of CO2 in the atmosphere has grown by 22 percent since 1960, not so good for humans but great for poison ivy and other vines, The Washington Post reported Tuesday. In a study in Durham, N.C., a researcher simulated the carbon dioxide content in the air 50 …