I think Earth's atmosphere is warmer than any other planet because of the people burning such dangerous chemicals. That's why our ozone layer is thinning out. The heat of the sun is trapped in the Earth. Also, Thermosphere, one of the atmosphere's layers, absorbs incoming high energy ultraviolet and x-ray radiation from the sun that causes a large temperature increase. Because of this absorption, the temperature increases with height and can reach as high as 3,600 °F (2,000 °C) near the top of this layer, however, despite the high temperature, this layer of the atmosphere would still feel very cold to our skin because of the extremely thin air.