Question

human influences on cycles
dramatically increasing carbon dioxide levels in the air.
this is closely linked to climate change, as higher carbon
dioxide concentrations contribute to global warming.
consequently, human actions pose challenges to the
stability of the carbon cycle and have broad
environmental consequences.
what is a consequence of humans heavily using
fossil fuels in the context of the carbon cycle?
increased precipitation
lower sea levels
significant release of carbon dioxide
reduced pollution

Explanation:

The text clearly states that human actions (like using fossil fuels) lead to "dramatically increasing carbon dioxide levels in the air". This directly matches the option "significant release of carbon dioxide". The other options (increased precipitation, lower sea levels, reduced pollution) are not supported by the given text about the carbon cycle and fossil - fuel use.

Answer:

C. significant release of carbon dioxide