13-For thousands of years, the processes that added and subtracted carbon dioxide from the atmosphere were in balance: a) Are they in balance now? b) What are the main reasons for the imbalance? c) How does this cause the imbalance?

Many factors, both natural and human, can cause changes in Earth's energy balance, including: Variations in the sun's energy reaching Earth. Changes in the reflective of Earth's atmosphere and surface. Changes in the greenhouse effect, which affects the amount of heat retained by Earth's atmosphere