so I’m being a guinea-pig for Andy Rankin again. Let’s try:
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hmmm… I think I prefer the CO2 Google Gadget as this number requires the author to say something somewhat accurate about what that number is. [It’s average global CO2… going up and up and up…] Worth pointing out that it does actually go up and down on a seasonal basis, so this is the global average rather than the exact concentration.. and that the magnitude of the oscillation will vary slightly depending on how much greenery there is in your local area and hence how muich atmospheric “breathing” is going on. Wherever you are though, this number you’re looking at is the average around which it will be oscillating.