So $800 million to capture 1.5MM tonnes.
And the global emissions from fossil fuels are 33,000MM tonnes.
Do you want me to do the maths for you or do you have a calculator handy?
* Actually it's 93% of 33,000MM tonnes, but that was the 2018 figure so probably near 31,000MM.
Round it down to 30,000MM, it probably won't make a massive difference to your stupidity.