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.
Unfortunately, the earth?s climate is increasing as excessive amount of heat is trapped inside the earth?s atmosphere because humans emitted too much greenhouse gases. Therefore, the cause of climate change is called the increasing greenhouse gases (specially, carbon dioxide) due to human activity. The representative gases of greenhouse gas are carbon dioxide, nitrous oxide, and methane.