In the industrial era, the rapid increase in the consumption has resulted in steep increases in CO2 emissions from fossil fuel burning and deforestation, and consequently an “unprecedented rate” of increase in atmospheric CO2. The enhanced greenhouse effect from the “anthropogenic” CO2 has led to accumulation of heat in the climate system as evidenced from recent records of temperature, glacier and sea ice extents, sea levels, etc. This “anthropogenic climate change” or “global warming” is one of many environmental challenges that humanity faces in this century. How long will the fossil fuel CO2 stay in the system? What are the natural processes that would remove atmospheric CO2 and bring the system back to pre-industrial state? A comprehensive look at the global carbon cycle can provide answers to these questions. In this talk, I will discuss the natural carbon cycle processes involving land plants, ocean and weathering of rocks that would eventually flush the “fossil” CO2 out of the atmosphere-ocean-land system on a 1,000,000-year timescale.