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A．Carbon dioxide in the atmosphere carries heat into outer space so as to change the climate.
B．Carbon dioxide may escape into the greenhouse so that the Earth will be made warmer.
C．As carbon dioxide keeps heat from escaping into outer space, the Earth may become warmer.
D．Carbon dioxide may make the Earth warmer because it lets the heat escape into outer space.

A．It is the production by termites that is now of greater concern.
B．What scientists worry more about is the output from burning fuels.
C．The output from burning fuels is now rising steadily.
D．The burning of fuels generates much less carbon dioxide than termites do.