With the current GHG content in the atmosphere, more solar energy arrives than leaves via radiation -LRB-.85 + / -.15 Watt / m ^ 2), which raises the heat content of the terrestrial system, i.e., the average
temperature over the whole earth + oceans + atmosphere.
I found that the general belief is that the average surface
temperature over the whole earth for a whole year has increased from ~ 288 K to 288.8 K in roughly 150 years, i.e. 0.3 % and that it is due to increased CO2.
Not exact matches
It is surprising what even 1 W / m2
over the
whole earth averaged
over a century can do to the system's
temperature.
So we have graphs showing
earth temperature over very long period: And roughly, the
whole graph period except the last 50 millions year, though it's seems it was bit cool around 450 million years ago.
`...
over the 100 years since 1870 the successive five year values of average
temperatures in England have been highly significantly correlated with the best estimates of the averages for the
whole Northern Hemisphere and for the
whole earth» (In this last comment he is no doubt referring to his work at CRU where global surface records back to 1860 or so were eventually gathered) he continued; «they probably mean that
over the last three centuries the CET
temperatures provide a reasonable indication of the tendency of the global climatic regime.»