Came across this study recently, in my view it is one of the strongest pieces of evidence supporting human caused climate change. measurements of increasing re-radiated longwave radiation back down to the surface corresponding to the exact wavelengths you would expect to see for increasing carbon dioxide. This forcing of 0.2 w/m^2 per decade far exceeds any other natural forcing, especially since solar activity was continuing to decline from 2000-2011. The sun was providing a very weak negative forcing .
This study is consistent with , and , but is more recent, and in my view visualizes this increase in greenhouse forcing well.