[NormsRevenge]

May Day! May Day!

Just another day on the spinning globe we call Homeland.

Maybe they ought to modify their Geoengineering strategies a bit.

Quit spraying crap in the air and figure out a way to neuter volcanos instead.

[BikerJoe]

Is this the reading they got from the top of Mauna Loa, a freakin’ active volcano?

[TheDon]

Yawn....the boy who cried wolf and all that...

[NormsRevenge]

[Night Hides Not]

Trees are lovin’ it!

[MUDDOG]

reached the crucial 400 threshold for the first time

And we're still here.

[wideawake]

"It is time to stop using the sky as a waste dump for our carbon dioxide pollution. If we fail to heed this warning, our children will end up living in a world that is much hotter than any human being has ever experienced."

Clearly Mr. Caldeira is a detached inquirer into the hidden mechanics of the universe, with no agenda of any kind.

His impartiality and disinterestedness are impeccable.

[smokingfrog]

Ban all carbonated drinks. They’re totally unnecessary.

(except for beer)

[Flick Lives]

If there is global warming, why am I still wearing my Winter coat in May?

[Adder]

only reached the crucial 400 threshold

Crucial because....?

Look, my dinosaurs LOVE this weather....

[Buckeye McFrog]

I believe a fact check will reveal it actually peaked in some prehistoric era when dinosaurs roamed the Earth.

[thackney]

saturated with carbon dioxide

A person who writes words for a living ought to learn the meaning of the words they use, instead of trying to terrorize others with false claims like this.

[upchuck]

Can somebody please post the "Oh noes" .gif? Thanks. Meantime, We're all gonna die!!

[nuke rocketeer]

I’ll panic and do what they recommend as soon as I see those who preach doom/gloom practice what they preach to us peasants

[Mom MD]

And yet the globe has not warmed for the past 10 years. I guess there is not a direct correlation as some would have us believe.....

[Cboldt]

Set a record?

[Milton Miteybad]

There's striking new evidence that Earth's atmosphere is increasingly saturated with carbon dioxide, the major gas from fossil fuel emissions that trigger climate change.

And yet, today's atmospheric CO2 levels are still far lower than in the distant geologic past. In the middle of the Jurassic period, atmospheric CO2 concentrations were roughly 2000 ppm. At the beginning of the Tertiary period some 65 million years ago, CO2 concentrations were still about 1000 ppm. It has been estimated that during the Cambrian period, atmospheric CO2 was as much as 7000 ppm.

At today's meager levels, it can be accurately said that the Earth's atmosphere is CO2-impoverished. The last time in geologic history CO2 levels were this low? 300 million years ago, during the Carboniferous and Permian periods.

[FatherofFive]

the major gas from fossil fuel emissions that trigger climate change

Here in Tulsa we are 14 degrees below average, and 31 degrees below the record high for the day.

It is a wonderful day, but clearly global warming is not happening. The climate has been changing for billions of years. There is no normal. The only normal is change.

[cuban leaf]

the major gas from fossil fuel emissions that trigger climate change.

---

WTF?

[onedoug]

"This should be taken as a warning," said Ken Caldeira, an atmospheric scientist with the Carnegie Institution's department of global ecology at Stanford University.

The "ecology" bit in the name gives the jig up right away. The "atmospheric scientist" schtik is suspect too. Is he a meteorologist, or not?

He should set the example and stop emitting CO2 by means of his own "ecological" systems.

[MasterGunner01]

Attention SFGate.com: some Basic Botany 101. Pants breathe in carbon dioxide and give of oxygen. This is a win-win, both for making happy plants and happy humans.