why percentage of carbon dioxide is not changing drastically?
Answers
Answer:
All life on planet Earth is carbon-based, and that carbon comes from the CO2 in the atmosphere. Carbon-hungry living things used up nearly all of that CO2, harvesting the carbon atoms, and releasing the oxygen as a waste product.
Every schoolchild learns that animals use O2 (oxygen) and produce CO2 (carbon dioxide), and plants do the opposite. But have you ever wondered why there are more than five hundred O2 molecules in the Earth’s atmosphere for each CO2 molecule?
On Venus and Mars it's the other way around. On those planets, nearly all of the oxygen in the atmosphere is in the form of CO2, and almost none is O2.
But on Earth O2 is 21% of the atmosphere, and CO2 is only 0.0415%. Do you know why?
It is because Venus and Mars are dead planets, and the Earth is not.
On planet Earth, carbon-hungry living things have used up nearly all the CO2, to get the carbon, discharging the O2 as a waste product. Life on Earth is carbon-based, and (for nearly all organisms) atmospheric CO2 is the only source for that carbon. Photosynthetic plants get their carbon directly from the atmosphere, and animals get their carbon by eating plants.
But, you might wonder, why aren't the CO2 and O2 levels similar? Why is there so little CO2, and so much O2?
Step outside and look around, and you'll have your answer: The plants outnumber us animals!