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Gases

Key Idea 6: Greenhouse Gases and Climate Change


How are greenhouse gases changing Earth's climate?


Atmospheric greenhouse gas concentrations are a key factor in our changing climate. However, you have now learned that greenhouse gases are required to keep the Earth warm enough for humans and other living things to survive. Why are people concerned about greenhouse gases?

First of all, what are greenhouse gases? Greenhouse gases are gases found in our troposphere that are capable of absorbing and re-emitting IR radiation. You have already learned about several substances that absorb IR radiation, including CO2, H2O and CFCs. Each of these is an important greenhouse gas.


Question For Thought

Greenhouse gases have warmed the Earth for billions of years, making our planet suitable for life. Why are we now concerned about greenhouse gases?

Gases - Greenhouse Gases and Climate Change
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