What effect does deforestation have on the carbon cycle?

Deforestation has a significant impact on the carbon cycle primarily by increasing atmospheric CO2 levels. Trees and forests play a crucial role in the carbon cycle by acting as carbon sinks. Through the process of photosynthesis, they absorb carbon dioxide from the atmosphere and convert it into organic matter, effectively removing CO2 and helping to regulate climate.

When deforestation occurs, not only is the carbon stored in trees released back into the atmosphere as CO2 when they are cut down or burned, but there is also a reduction in the number of trees available to absorb carbon. This dual effect leads to an overall increase in atmospheric CO2 levels, contributing to global warming and climate change.

Therefore, the correct answer highlights how deforestation disrupts the balance of the carbon cycle by adding more CO2 to the atmosphere and diminishing the planet's ability to sequester carbon.