News Earth Pumped-up Poison Ivy: Carbon dioxide boosts plant’s size, toxicity Share this:FacebookTwitterPocketRedditPrintEmail By Susan Milius May 31, 2006 at 9:29 am This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe