Rising CO2 levels lead to bigger, stronger rash-causing weeds
                                
                                
                                    (Newser) -
                                    Poison ivy is getting bigger and more potent, and the culprit is the 21st century's all-purpose scapegoat: climate change. The itchy, rash-inducing plant that has plagued hikers and gardeners since the beginning of time thrives in environments with high levels of CO2, the Journal reports, and with rates on the...