General purpose of this lecture is to present on Global Warming and Nuclear Energy. Carbon Dioxide Concentrations are low in glacial periods and higher in warmer interglacial periods. However, concentrations now are higher than at any time in the last 450,000 years. In the insert is the dramatic growth over the last 50 years. CO2 causes most of the positive radiative forcing of climate, but the sum of the other greenhouse gases is comparable.