Good catch, denmor. Posters should not be mocking you for finding it :(
Here are a couple of other articles you might be interested in, discussing research into any potential link between rising levels of CO2 and human health:
I expect studying links between CO2 and human health will become more important with CO2 to rise above 400 ppm later this decade. Given CO2 has probably never been this high since humans evolved, who knows what other impacts it might have.