Question

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fossil fuels are involved in the carbon cycle and are currently our worlds primary sources of energy. fossil fuels are formed from organic matter over the course of millions of years. there has been a growing concern about peoples increased usage and dependence on fossil fuels. how has fossil fuel usage over time affected the carbon cycle?
decreased combustion of fossil fuels will deplete our carbon reserves found underground
increased combustion of fossil fuels will lead to higher levels of carbon dioxide in the atmosphere
increased combustion of fossil fuels will encourage higher rates of cellular respiration
decreased combustion of fossil fuels will lead to more available carbon for photosynthetic organisms

Explanation:

Fossil fuel combustion releases carbon - stored for millions of years - as carbon dioxide into the atmosphere. Decreased combustion would not deplete carbon reserves but conserve them. Cellular respiration is a biological process not directly affected by fossil fuel combustion. Decreased combustion doesn't directly provide more carbon for photosynthetic organisms. Increased combustion of fossil fuels releases more carbon dioxide into the atmosphere.

Answer:

Increased combustion of fossil fuels will lead to higher levels of carbon dioxide in the atmosphere