Why is there only 0.03% co2 in atmosphere?
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because it is used by plants
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Carbon dioxide (CO2) is the 5th most abundant gas in the atmosphere and, together with water vapor, probably the best known of the greenhouse gases.

Most everyone agrees that human activities are causing the atmospheric concentration of carbon dioxide to slowly increase. We'll look at some of the experimental evidence in a moment.

Not everyone agrees however about the effect that increasing amounts of CO2 will have on the earth's energy budget and climate. The worry is that increasing greenhouse gas concentrations will strengthen the greenhouse effect and will cause the earth's surface to warm.
It is important to remember that the greenhouse effect isn't all bad, it has a beneficial side. You might refer to this as the natural greenhouse effect (i.e. one that has not been affected or influenced by human activities)

Most everyone agrees that human activities are causing the atmospheric concentration of carbon dioxide to slowly increase. We'll look at some of the experimental evidence in a moment.

Not everyone agrees however about the effect that increasing amounts of CO2 will have on the earth's energy budget and climate. The worry is that increasing greenhouse gas concentrations will strengthen the greenhouse effect and will cause the earth's surface to warm.
It is important to remember that the greenhouse effect isn't all bad, it has a beneficial side. You might refer to this as the natural greenhouse effect (i.e. one that has not been affected or influenced by human activities)
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