[dennisw]

Nitrogen	78.0842%
Oxygen	20.9463%
Argon	0.93422%
Carbon dioxide	0.03811%
Water vapor	about 1%
Other	0.002%

Wikipedia
One third of one percent is 0.033333%

CO2 rise of  from 0.02870%  to   0.03811% in one hundred years

You are correct!
The eco-freaks are going crazy over CO2 increasing less than one tenth of one percent.

Roughly -  in 100 years they claim CO2 has risen just short of one tenth of a percent ---->>>0.02870%  to   0.03811%

[Paladin2]

One third of one percent is 0.033333%

Perhaps 0.33333%

Note 1/3 of 1 is 0.333333333.

[submarinerswife]

The eco-freaks are going crazy over CO2 increasing less than one tenth of one percent

Have they attempted to prove that Co2 is the culprit that is causing this warming/cooling thing?

Has anyone figured in the big volcanoes under the Artic as maybe having something to do with some ice melting?

[Lonesome in Massachussets]

The argument goes something like this: Unpolarized molecules like O2, N2 and Ar have essentially no interaction with infrared radiation. Polarized molecules like CO2 and H20 account for almost all the trapping of IR radiation. This has the effect of shifting the equilibrium point to higher temperatures. The unpolarized molecules don't even count, they're aren't there for the purpose of warming the earth. Without C02 or water vapor the equator would be as cold as poles are now.

By that standard there has been approximately a 30% increase in the contribution of CO2 since 1861, for whatever reasons. I don't know the relative contributions of CO2 and water vapor, assume either molecule has about the same effect. In that case there has been about 1% increase in greenhouse gases since 1861, with perhaps a total increase of 2% by the end of the century.

How will such an increase effect climate? I don't know. I don't trust the models because they are not poorly validated, they are completely unvalidated, or worse, empirically refuted.

Further, as the author points out, the stridency of the advocates makes one doubt not only their motives, but their sanity. There are clever people who are blinded by the need to feel significant. Al Gore would fit into this class if he were clever. The Rosenbergs are sort of the exemplar of the class, people who sacrifice their lives to fulfill an messianic ego trip.