Answer:
1.3 ppm per year.
Explanation:
Carbon dioxide is released in the air which causes atmospheric pressure on the earth. Over the past 150 years the increase in average atmospheric concentration of carbon dioxide is 280 to 380 parts per million or ppm. The concentration rise in carbon dioxide will create a burden on ozone layer of the earth. Carbon dioxide atmospheric concentration varies during ice ages. The climate change has resulted in frequent fluctuation due to this reason.
