Having penchant in current affairs, I scratch my basic biology to keep myself abreast on Climate Change debate. What I retrieved from my notes is autotrophic a heterotrophic nutrition between flora and fauna that keep carbon dioxide and oxygen in equilibrium.
Oh! with Climate Change, and global warming as resultant; carbon dioxide might alarmingly rise with effects of varying levels of oxygen and carbon dioxide in the human tissues jerking hypoxia and hypercania respectively.
Hypoxia is a deficiency of oxygen in tissues. If prolonged, hypoxia may lead to severe and sometimes permanent changes in the brain.
Hypercania refers to the accumulation of carbon dioxide in human tissues. Hypercapnia leads to a depression of the central nervous system resulting in confusion and decreased sensation. If prolonged, coma and death may result. Guess what! extinction of humanity.