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They know because they can work out what percentages of which gas were around through ice samples taken from Antarctica

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Q: How do scientists know that there is more carbon dioxide and other greenhouse gases in the air than there was thousands of years ago?
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Related questions

What do scientists believe is happening to the earth because of the greenhouse effect and pollution?

Scientists believe that global warming is happening to the earth because of the greenhouse effect and carbon dioxide pollution in the atmosphere.


Scientists who are concerned about increased carbon dioxide in the atmosphere believe global warming is caused by?

... the burning of fossil fuels, which is adding extra carbon dioxide to the greenhouse gases in the atmosphere.


What is carbon dioxide in the greenhouse effect?

Carbon dioxide is the main greenhouse gas. It also causes global warming.


How is cabron dixiode related to the greenhouse effect?

Carbon dioxide helps the greenhouse in one way. Plants in the greenhouse needs carbon dioxide to grow.


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.


What do scientists suggest is the reason for global warming?

Burning fossil fuels adds extra carbon dioxide to the greenhouse gases in the atmosphere.Deforestation removes forests that used to take carbon dioxide from the atmosphere.


Why are studies of volcanoes helpful to scientists who wish to understand the greenhouse effect?

Volcanoes, like the burning of fossil fuels, are also a source of the primary greenhouse gas, carbon dioxide.


What is the greenhouse affect?

The greenhouse effect occurs when certain gasses in the atmosphere trap infrared radiation. This effect makes the planet warmer than it would be without a greenhouse effect.The greenhouse effect is caused by greenhouse gases; the most important greenhouse gasses in Earth's atmosphere are: water vapor, carbon dioxide, and methane.Recently, the greenhouse effect has gotten stronger. Scientists believe this is because humans have been using large amounts of fossil fuels, which release carbon dioxide when they are burned. Since carbon dioxide is a greenhouse gas, it has caused the planet to warm over the past 150 years.


What is carbon dioxide known as?

Greenhouse gas.


Which of the following is a greenhouse gas?

Carbon dioxide


What greenhouse gas do scientists believe has increased due to pollution?

Carbon dioxide, from the burning of coal, oil and natural gas, the fossil fuels.


Carbon dioxide is known as?

Carbon dioxide is known as a greenhouse gas which cause global warming.