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.
if carbon dioxide becomes more common in our upper atmosphere because of less palnts and more cardon than average being released into the atmosphere, it will rise temperatures. the CO2 will act as a green house also known as the greenhouse effect and this traps heat in the earth resulting in a steady global warming.