Too Late

Earth. The stratosphere, 50 kilometers above the ground. The stratosphere was the exact opposite of the troposphere beneath it, which lay close to the Earth's surface: cold below, hot above. In mid-latitude regions, the stratosphere lay between 10 and 50 kilometers above the surface, while at the poles, it began at around 8 kilometers above the ground. Above the troposphere and up to 50 kilometers above sea level, air currents mainly moved horizontally and convection weakened.