And if the buses are fueled with biodiesel, carbon-dioxide emissions would be cut by 90 percent.
Now it is quite certain that the proportion of carbon-dioxide was greatly reduced in the Pleistocene.
The reduction of the carbon-dioxide would be even more gradual.
But the planetesimal hypothesis has no room for this enormous percentage of carbon-dioxide in the primitive atmosphere.
Then air-rejuvenator apparatus reseparated it from the carbon-dioxide you exhaled, so that you could use it over and over.
Whatever excess of carbon-dioxide there may have been in the early atmosphere was cleared by the Coal-forests.
Every molecule of carbon-dioxide that crystallized out took two atoms of oxygen with it, completely out of circulation.
The ocean, also, as it became colder, would absorb larger and larger quantities of carbon-dioxide.
In the form of carbon-dioxide the leaves eat up the carbon and oxygen from the atmosphere.
A part is expelled by the lungs as carbon-dioxide, or as it is generally though less correctly termed, carbonic acid.
carbon dioxide n.
A colorless, odorless, incombustible gas formed during respiration, combustion, and organic decomposition and used in inert atmospheres, fire extinguishers, and aerosols.
|carbon dioxide |
A colorless, odorless gas that is present in the atmosphere and is formed when any fuel containing carbon is burned. It is breathed out of an animal's lungs during respiration, is produced by the decay of organic matter, and is used by plants in photosynthesis. Carbon dioxide is also used in refrigeration, fire extinguishers, and carbonated drinks. Chemical formula: CO2.
Note: Carbon dioxide is normally found as a gas that is breathed out by animals and absorbed by green plants. The plants, in turn, return oxygen to the atmosphere. (See carbon cycle and respiration.)
Note: Carbon dioxide is also given off in the burning of fossil fuels (see greenhouse effect).