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And today, NOAA announced that Earth has just broken 400 ppm CO2, for the
first time in human history.  Given the natural fluctuations, it will
probably dance around the 400 mark for a couple of years, before leaving it
behind on its way to even higher levels.  (And inevitably, some denialists
will crow about falling CO2 levels during its seasonal dip in a few months.)

You can "follow" the CO2 numbers on UCSD's Keeling curve website and
Twitter feed: https://twitter.com/Keeling_curve


On Fri, May 3, 2013 at 9:41 AM, Charles Carlson
<[log in to unmask]>wrote:

> We're a shade below and closing fast.  We have achieved another planetary
> first.
>
>
> http://science.time.com/2013/05/02/greenhouse-effect-co2-concentrations-set-to-hit-record-high/#ixzz2SCSIWOa4
>
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> C
>
> *The opinions and thoughts expressed here are my own and should in no way
> be construed or attributed to the Exploratorium or related organization,
> and do not represent an institutional position.
> Charles Carlson
> *
> http://blogs.exploratorium.edu/whyintercept/
> Twitter: @charliec53
> email: [log in to unmask]  <http://www.exploratorium.edu/>
> Tel:   415-528-4319
> Fax:  415-885-6011
>
>
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