Is Climate Change mainly driven by the sun? Or, are humans causing these changes?

Sunrise over Athens, Greece

The Die kalte Sonne site here features a worrisome essay by German climate scientists Horst-Joachim Lüdecke, Dr. Alexander Hempelmann and Carl Otto Weiss. They carefully examined climate changes of the past and have found that the recent changes (of the last 40 years are nothing out of the ordinary and that we need to worry about a global cooling that will persist until 2080.
They published 2 papers on the subject in the journal European Geophysical Union (EGU) [2], [3].

According to the 2 scientists, climate is often cyclic. The first study appeared in February 2013 and it examined six of the longest existing thermometer data series recorded in Europe, as well as one dataset from an Antarctic ice core and another from a data series extracted from stalagmites. The datasets were covered the period of 1757 – 2010.

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