[Coral-List] CO2 hits 400ppm

Stablein, Wade wade_stablein at nps.gov
Fri May 10 15:23:43 EDT 2013

“We’re going to race through 400 like we didn’t see it go by,” Dr. Keeling

Dr Keeling predicted we would see 400ppm sometime around May, 2014..  One
year earlier than predicted, the curve becomes steeper.

On Thu, May 9, 2013 at 9:00 PM, BRUCE CARLSON <exallias2 at gmail.com> wrote:

> Probably everyone (in the U.S.) has heard the news that the Dow Jones
> average has surpassed 15,000 and everyone is jubilant.
> You may have missed another story that appeared at almost the same time.
>  Here is an excerpt of that story from The Economist:
>  "At NOON on May 4th the carbon-dioxide concentration in the atmosphere
> around the Mauna Loa Observatory in Hawaii hit 400 parts per million (ppm).
> The average for the day was 399.73 and researchers at the observatory
> expect this figure, too, to exceed 400 in the next few days. The last time
> such values prevailed on Earth was in the Pliocene epoch, 4m years ago,
> when jungles covered northern Canada.  There have already been a few
> readings above 400ppm elsewhere—those taken over the Arctic Ocean in May
> 2012, for example—but they were exceptional. Mauna Loa is the benchmark for
> CO2 measurement ... because Hawaii is so far from large concentrations of
> humanity."
> We all know the predictions for climate change and ocean chemistry change
> as we now head, inevitably it appears, to 450ppm.
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Wade O. Stablein
Science and Resources Management

Padre Island National Seashore
National Park Service
P.O. Box 181300
Corpus Christi, TX 78480-1300
20301 Park Road 22
Corpus Christi, TX  78418

Phone: (361) 949-8173, ext. 224
Fax: (361) 949-7091

wade_stablein at nps.gov

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