[Paladin2]

"CO2 is roughly 1/3 of one percent of our atmosphere"

Perhaps roughly 1/30 of one percent?

[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%