If carbon dioxide gas is generated in large enough quantities, it will collect in the atmosphere and cause an unwelcome warming effect on climate.
The decay of plants, including trees, generates carbon dioxide, but in forests such carbon dioxide is balanced by the carbon dioxide taken in by living plants, which give off oxygen.
The use in industry of fuels derived from plants generates a large amount of carbon dioxide; such fuels include wood, coal, and oil.
If the statements above are true, which of the following can properly be concluded from them?
(A) All of the carbon dioxide that can be generated in an industrial society is attributable to plants, directly or indirectly.
(B) An unwelcome warming effect on climate cannot be avoided, since carbon dioxide is given off by the natural processes of decay in plants.
(C) Forests contribute as much carbon dioxide to the atmosphere as does the industrial use of fuel derived from plants.
(D) A society that uses plant-based fuels in industry will contribute a net surplus of carbon dioxide to the atmosphere, unless the gas is reabsorbed in some way.
(E) No matter which fuels are used by industry, there is bound to be an increase in the total amount of carbon dioxide in the atmosphere and a consequent unwelcome warming effect on climate.