There are records from an observatory on Hawaii which has been recording temperature for the last 100 years. There is a continuous trend of rising, with annual wavelike structures in the graph in line with the seasons. This rise pattern is matched by the increase in CO2 (possibly also collected at Hawaii), including the seasonal variations, attributed to the deciduous forests in the north. The overall rising trend is also matched (without seasonal ups and downs) by the increase in industrialisation). This may not be proof, but looks like good epidemiology. I learned this from a lecture presented to the Open University Geological Society a few years ago, and it was presented with references, but I am afraid I cannot recall them, or the lecturer.

Penny