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4

The short answer is no, not anywhere close to 200ppm and not appreciably lower than ambient conditions. The modern standard for buildings is a full air change every three hours. This means your houseplants would need to achieve your target level on a full house volume of air every three hours. There is no practical arrangement which will achieve this. ...


4

Domestic flywheels are unlikely to happen for 3 reasons: They must be heavy to store significant energy. If you need a crane to install one at your house it’s never going to be super cheap, even with high volume manufacture. The risk of the spinning mass fracturing requires special safety precautions - commercial operators put them in the ground but that ...


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