How does the burning of fossil fuels by humans affect the carbon cycle?

The carbon cycle moves carbon in and out of the atmosphere and has kept a balance there for millions of years. The carbon dioxide (CO2) and other greenhouse gases in the atmosphere have kept the earth warm. Burning fossil fuel releases CO2 that has been held underground for millennia, so this carbon is an extra burdenon the carbon cycle, and it is not able to remove all the extra CO2.

This is how the carbon cycle is being disturbed. This is what is causing global warming and hence climate change.