Greenhouse gases make up about a percent of all of the molecules in the atmosphere, and CO2 makes up about .038% by volume. That is an increase from .028% from pre-industrial time (fixed– comments). That means that today, if you went through the atmosphere sifting through molecules and collected one million of them, you should only find 380 that were CO2. There are often remarks which read like “how can such a small amount make such a large difference?”
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