Hmm, I think I'll go with the three that actually make sense - Hydrofluorocarbons, water vapor, and carbon dioxide. Hydrogen and carbon monoxide? Not so much.
Okay, let me see. Carbon monoxide and hydrogen definitely aren't greenhouse gases, so those are easy to eliminate. I just need to confirm the other three. *thinks* Yep, I'm confident those are the right answers.
I'm a little unsure about this one. I know carbon dioxide is a greenhouse gas, but I'm not totally sure about the others. I'll have to use my best judgment and hope I get it right.
Hmm, this seems straightforward. I know carbon dioxide and hydrofluorocarbons are greenhouse gases, and I think water vapor is too. I'll double-check the other options to be sure.
I'm pretty sure carbon dioxide, hydrofluorocarbons, and water vapor are greenhouse gases, but I'm not sure about the others. I'll need to think this through carefully.
Karl
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