Breaks 400ppm

[Politico]

Cool. Can we get it to 500?

Since we have also raised the CH4 from around 700-800 ppb to over 1800 ppb, and CH4, on a decade span, is over 100 times as effective of a GHG as CO2, we have already reached the equivelent of 500 ppm.

Cool. Rock on.

 

[Abraham3]

I want to express my admiration that someone around here would finally make use of an honest self-portrait as an avatar...

 

[Abraham3]

All the evidence show CO2 lags temperature on both the upside and downside

That would be incorrect. See Shakun 2012 http://www.nature.com/nature/journal/v484/n7392/full/nature10915.html