The CO2 concentration in the atmosphere by about thirty percent, due to Human beings have increased, the increase is proportional to increases in fossil fuel combustion ,for electricity generation, transportation, and heating, and also the manufacture of cement , (human caused) emissions. It is predicted that we’ll soon reach carbon dioxide concentrations that haven’t been seen on Earth in the last 50 million years, which is eventually leading to changes in the Earth’s average surface temperature, which is really proving fatal to human lives.