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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.
Jonny69
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?