Those zeroes are noticeable

OK, the difference between 398 and 400 is not that big.  It's only 2 ppm.  (If you haven't gotten the gist yet, I'm talking about atmospheric CO2 concentrations).   But perhaps, in the global public mind, the difference will be significant and noticeable.   We can only hope.   Now, realize that officially (i.e., Keeling curve officially) we're not at 400 yet -- just some samples taken in the Arctic.  But we're getting there, we're close, and that's a line that we're all going to cross, together.

So here's the story on where we are, from the Huffington Post.

Carbon Dioxide Levels in World's Air Reach Troubling Milestone

So far, only the Arctic has reached that 400 level, but the rest of the world will follow soon.  "The fact that it's 400 is significant," said Jim Butler, global monitoring director at the National Oceanic and Atmospheric Administration's Earth System Research Lab in Boulder, Colo. "It's just a reminder to everybody that we haven't fixed this and we're still in trouble."

The Arctic is the leading indicator in global warming, both in carbon dioxide in the air and effects, said Pieter Tans, a senior NOAA scientist.  "This is the first time the entire Arctic is that high," he said.  Tans called reaching the 400 number "depressing," and Butler said it was "a troubling milestone."

 Now, I wonder if Climate Depot had anything to say about this?  Well, he has a link to an article from Steven Goddard.   Who has no credentials evident anywhere to talk about anything related to climate.  Now, I've studied climate and environmental impacts as part of my job as a nuclear energy consultant.  I don't claim to be an expert, just someone who attempts to understand.  But I don't know anything about Goddard, nor does Goddard reveal anything about himself.

But the thing is, Goddard doesn't question the number, because the number is real.  All he does is question the rate at which we got to the number.

Is that really a major concern?  The number is going to keep going up until we take MAJOR, global-economy-changing steps to change that trajectory significantly.

Now, I also note that Climate Depot has said nary a word about the new Southern Hemisphere hockey stick.  (And I'll have more on this, too.)