What is the most abundant greenhouse gas?

What is the most abundant greenhouse gas?
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Answer :

Water vapor is the most abundant greenhouse gas in theatmosphere, accounting for somewhere between 1/2 and 2/3 of thetotal effect. CO2 is the next most abundant.
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(2) it is lighter than air Explanation: Helium is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. A well-known but minor use is as a lifting gas in balloons and airships

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