Myth: We can reduce CO2 levels by using special fans

If global warming gets out of hand, we can use carbon dioxide ‘fans’ to suck CO₂ out of the atmosphere and sequester it safely underground. 

Fact:

Certainly, this can be done, but it is prohibitively expensive. Given the technology available today, it costs about US$100 a tonne to scrub CO₂ from the atmosphere. This means that in order to remove all the CO₂ emitted by humans in a year, we would need to spend US$5.5 trillion, or more than Japan’s entire GDP. It would be much cheaper to simply stop the emissions in the first place.