Get an amiable friend, and do some heavy breathing in the garden. Good for the plants, good for you, and if you do it right, good for your friend.

Seriously though, humans are fairly large animals, and a pair of humans does vent off a fair amount of CO2 during coitus.
.
Leonardo de Garden Reviewed by Leonardo de Garden on . DIY CO2 generation Get an amiable friend, and do some heavy breathing in the garden. Good for the plants, good for you, and if you do it right, good for your friend. Seriously though, humans are fairly large animals, and a pair of humans does vent off a fair amount of CO2 during coitus. . Rating: 5