Atmospheric carbon dioxide is the primary source of carbon in life on Earth and its concentration in Earth's pre-industrial atmosphere since late in the Precambrian was regulated by photosynthetic organisms and geological phenomena.
At about 55 km, the mesosphere begins. In the mesosphere, the temperature decreases with height again, because there is very little ozone to warm up the air. Finally, the mesopause divides the mesosphere from the thermosphere, which is the section of the atmosphere higher than 90 km. In this region, the temperature increases again. This time, it is molecular oxygen (O2) that causes the temperature increase.
Report Abuse. This answer is about the conditions in the troposphere (the lowest 25000-50000 ft (8-15 km) of the atmosphere): Generally, and averagely, the temperature decreases with altitude. On an average, the temperature decreases by 3.5 degrees F for every 1000 ft of altitude (6.5 degrees C for every 1000 meters).