Not doing a scientific study, not claiming to have accurate to a T numbers. Now, the methodology of “what does the internet think” is flawed, and prone to manipulation, but it gives one a cursory glance at “what does public opinion say about X”.
I’m not using it as a source of perfectly accurate information, I’m using it as a quick eye catching graphic that makes a valid point.
http://www.gallup.com/poll/12751/labor-unions.aspx
http://www.debate.org/opinions/does-child-labor-help-third-world-countries