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Well it is only 4000 tonnes of CO2 per year.
Maybe it is a proof of concept and can easily be scaled up with diminishing costs
for a plant 10x the size?
mespilus-
The 870 cars figure must relate to only the CO2 cost of building them. The fuel to run a typical car over 120,000 miles runs to about 30 tonnes CO2.
120000 miles at 45 mpg (let's be realistic) = 2666 gallons = 12100 litres.
1 kg of petrol produces 2.7 kg CO2 when burned
12100 litres = 32700 kg CO2 = roughly 30 tonnes CO2
Give or take a bit because 1 litre is not 1 kg. Some cars are more and less fuel efficient. A lot of cars go further than 120k miles. Diesel is 3.3 kg CO2 per kg etc etc. But that's your ballpark.
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It is a proof of concept thing. This article has more info on how it works, and talks about 2 plants being built, 1 in Canada and 1 in Scotland, that will each remove amillion metric tons of carbon dioxide a year from the atmosphere:
https://thebulletin.org/2021/08/carbon-capture-dream-or-nightmare-could-be-coming-or-not/
Jonny69
Avidfan
870 cars seems so low, the move to E10 petrol last week was supposed to be the equivalent of taking 350,000 cars off the UK roads