Yearly variations in the atmospheric carbon dioxideconcentration are caused by
A, greater amount of coal burning in the northern hemisphereduring the winter months.
B. increased automobile travel during vacation time in the U.S.,which is mainly during the summer months.
C. an increase in noxious gases emitted in political speechesduring election time.
D. increased photosynthesis during the norther hemisphericsummer.
Yearly variations in the atmospheric carbon dioxide concentration are caused by A, greater amount of coal burning in the
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Yearly variations in the atmospheric carbon dioxide concentration are caused by A, greater amount of coal burning in the
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