Volcanos carbon monoxide from

CO has always been a part of the imiverse. However, atmospheric CO has increased over time. When volcanoes erupted, continents collided, and winds embraced the trees sparking fires millions of years ago, all this contributed to the stock of CO. However, when CO first made a significant presence in the air we breathe, humans lived in the open. A very long time must have passed by before humans inhabited caves or built enclosures for protection from the effects of the weather or the tyranny of predators. In the process, however, humankind invited the unwanted guest -carbon monoxide, the silent killer. So where there is smoke, there is not only fire but also CO in terms of human cost, the latter is more dangerous than the former. Yet it must have taken several thousands of years to tame the fire, and over those years CO has claimed many innocent victims who went to sleep after a hearty meal never to wake up. The knowledge of these mysterious events has been unraveled over time. 

Volcanos send sulfur dioxide and carbon monoxide into the air. Forest fires also add carbon monoxide. Tiny living creatures remove some of these poisonous gases from the air. Human activity adds many different gases into... 

Volcanic eruptions can cause some harmful health effects. Tourists were kept at some distance from the 2011 eruption of the Kilauea volcano (see Section 9.4.1) because of its emissions of sulfur dioxide gas. People may suffocate in the carbon dioxide or be poisoned by the toxic carbon monoxide and hydrogen sulfide. (If the geothermally active Yellowstone National Park in the United States was an industrial installation, it is likely that authorities would consider placing some areas off limits because of emissions of hydrogen sulfide, readily detected by visitors by its foul odor.) Fine particles blown into the atmosphere from volcanic eruptions can cause respiratory problems when inhaled. Plants may be killed or their growth stunted by exposure to sulfur dioxide and hydrogen sulfide from volcanoes. 

---