Another way to know your number is wrong is to consider the fact that the US emits ~5.5 gigatons of CO2 per year. If it cost only $1 a ton to sequester that then the total cost would only be only 5.5 billion dollars a year.
That's....not very much at all. Global warming wouldn't be a problem if Jeff Bezos could fix it by himself.
Feel free to point out where my math is wrong, or what any of the numbers should be. I show my math work in the blog article I linked to. I would be happy to make any corrections.