>No, it has only warmed, otherwise we'd be in another ice age. Theres no sources that support that, but ok. > The periodic variability in earth's orbit should

>No, it has only warmed, otherwise we'd be in another ice age. Theres no sources that support that, but ok. > The periodic variability in earth's orbit should have us cooling ever so slightly >That is only a single input. The other input is solar activity, which has increased. Solar activity has been declining for 40 years exactly at the same time as the planet has been warming to record high temps. Solar has been ruled out not only through direct observation, but also through the nature of the warming. The lower levels of the atmosphere are warming fast while the upper reaches like the stratosphere are cooling. This is because the heat is being trapped at lower levels by the increasing greenhouse effect. Also night time temps are increasing faster than day time temps. Both of these are fingerprints of greenhouse warming and not solar.