Here's more examples showing how current CO2 levels are quite low; they are very mild.

Folks who listen only to main stream media may get the idea that the current levels of CO2 are dangerously high--WRONG.   And there's even false reports that crop yields may decline-- NOPE.  Also alleging that CO2 is a dangerous pollutant-- ITS NOT  Implying that current levels are unprecedented-- VERY FALSE

But when looking into the scientific history, all those false reports are debunked.    Actually there could be a doubling, tripling, even quadrupling and still be well within historic levels.   Current levels average about 420 ppm, and  even if quadrupling would be well below 2,000 ppm.

Acceptable levels in meeting rooms and classrooms are 1,000 to 1,100 ppm.  And the standard for naval submarines is 5,000 ppm.

Here's a historic chart of CO2 levels over the eons.  This supports the idea often mentioned by climate skeptics pointing out how current levels are quite low.

Image Title: CO2 levels 600 million yrs 
Image Info: Current CO2 levels are very low, compared with historic levels.  

Here's a chart showing prior warming periods, which all exceeded the current summer's temperatures

Image below from Tom Hemmick - Image Title: 11,000 yrs Temperatures Uploaded: undefined
Image Info: Chart shows Earths warm periods, over the eons.  Multiple examples with temps higher than now prevailing.