cause of carbon dioxide rise
Carbon dioxide increase causes air pollution deaths. Each degree Celsius rise in temperature caused by increased carbon dioxide levels could cause about 1,000 deaths from air pollution each year in the US, says Mark Jacobson of Stanford University, US. The gas boosts concentrations of surface ozone, particles and carcinogens, all of which are detrimental to human health.
However, human activities are now increasing the concentration of carbon dioxide in our atmosphere, amplifying the natural warming caused by the greenhouse effect. During the Industrial Revolution, humans began burning coal, natural gas, and oil to power machines for manufacturing and transportation.
Burning carbon requires oxygen (O2), and when we burn an atom of carbon, the required oxygen becomes part of the CO2 molecule. So if the CO2 increase is caused by burning carbon (fossil fuels), we would expect atmospheric O2 levels to decrease at the same rate. And that's indeed what we observe (Figure 1).