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Carbon dioxide levels have not fallen. They have been gradually increasing for the past 250 years when man began burning fossil fuels and cutting down trees. Since 1980 CO2 levels have increased more rapidly than ever before.

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Q: Why have carbon dioxide levels in the earth fallen?
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Carbon dioxide in a sentence?

The carbon Dioxide levels in the Earth's atmosphere are rising.


How would a drastic reduction in plant life on earth affect the atmosphere?

levels of oxygen and carbon dioxide would decrease and levels of carbon dioxide would increase.


What name is given to warming of the earth due to increased levels of carbon dioxide?

The warming of the earth due to increased levels of carbon dioxide is called the Greenhouse effect. Global warming is a result of the greenhouse effect.


Starting billions of years ago algae lowered the levels in the atmosphere?

Carbon Dioxide


What planet has carbon dioxide and nitrogen in its atmosphere?

Earth, Mars and venus all have nitrogen and Carbon dioxide in their atmosphere, though the levels vary from planet to planet.


How much hotter is the earth since the levels of carbon dioxide went up?

the earth is much hotter like 100%


Why were levels of carbon dioxide so high when the earth was first formed?

Because there were no plant life forms on the Earth when it was first created.


How does the formation of sedimentary rocks reduce carbon dioxide levels?

Because sedimentary rocks are formed from tiny animals which have died and fallen to the sea bed millions of years ago. Due to more substances falling onto the sea bed above the animals, they are pressurized underground. Due to the heat of Earth's core, the animals are burnt under the ground, turning into fossil fuels.These animals contain carbon dioxide, and reduce the levels from the atmosphere by dying and travelling underground. This is how sedimentary rocks are a reason for reduced levels of carbon dioxide in the modern atmosphere.Other reasons are that the carbon dioxide dissolved into oceans which were formed millions of years ago. Also, the formation of plants reduced the carbon dioxide levels due to photosynthesis, as they intake it and do not replace it, as they produce oxygen and glucose as a result of photosynthesis.


How do scientists think that increased carbon dioxide levels contribute to global warming?

Carbon dioxide is a greenhouse gas. Greenhouse gases capture and retain the sun's heat. Increased carbon dioxide levels mean that more and more of this heat is retained. This is warming the earth and the atmosphere all round the world - global warming.


Why does the level of carbon dioxide affect the global temperature?

Carbon dioxide (and other gases) creates a "blanket" around the earth trapping heat in the atmosphere. If these "greenhouse" gases were not there some of the heat would escape from the earth's atmosphere --------------------------------------------------------------------------------------- Carbon dioxide is transparent to visible light but opaque to infrared light (i.e. heat). When sunlight passes through the atmosphere and heats the surface of the earth the earth radiates infrared light. At low levels of carbon dioxide most of this infrared escapes to space, cooling the earth; but at high levels of carbon dioxide most of this infrared is reflected back down to the surface of the earth, keeping it hot.


What does fossil evidence show about Earth's climate?

The fossil evidence shows that the Earth's climate before had high levels of carbon dioxide. The plants that evolved consumed this carbon dioxide out of the air and formed oxygen, coal, limestone, and other fuels.


Is carbon dioxide unique to earth?

Carbon Dioxide do exist in universe in places other than Earth.