Great question! The major gases responsible
for the greenhouse effect are water vapor, carbon
dioxide, methane, and ozone. These molecules
absorb radiation from earth's surface and then
send it back (or re-emit) to the surface, keeping
the earth warm. Though water vapor makes up of the
highest percentage of greenhouse gases, we usually
talk about carbon dioxide as a major gas
because it stays in the atmosphere much longer
than water vapor and therefore has greater warming
Thanks for the question!
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