[lopmotr]

You should explicitly state the logic you're implying and the conclusions. That way, if there are any embarrassing mistakes, they'll be obvious. Are you saying that with 1200-2000ppm, we'll have another extinction event? That it will include humans? Also that we expect to reach that concentration in our childrens' lifetimes? Those claims together are certainly not what scientists predict, so I don't know if you're wrong or using some other logic that I didn't infer correctly from your words.