Although the basic physics of global warming due to anthropogenic release of CO2 has been understood for more than 100 years, a large portion of the U.S. population mistrusts scientists on this vital issue. In this talk, I will review the fundamentals of radiation transfer in the Earth/atmosphere system. The Ice Ages will be shown to be an excellent calibration tool for the response of the global temperature to forcing. I will review the latest temperature measurements of the surface and ocean, as well as the response of the polar ice sheets to the increased temperature.