From the paper... "The 0.05%/decade minimum-to-minimum trend
appears to be significant. If so it has profound implications
for both solar physics and climatology. For solar physics it
means that TSI variability can be caused by unknown
mechanisms other than the solar magnetic activity cycle.
Much longer time scales for TSI variations are therefore a
possibility, which has obvious implications for solar forcing
of climate."

We have only about 2 decades of solar data at this level so it's too soon to tell if this is part of an ongoing uptrend or not. Yet another reason why climate needs more study before economic destabilizing actions are mandated.

-p