“Denying the basic existence of climate change is no longer a credible position,”
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Everybody agrees that the climate changes, we know there have been Ice Ages repeatedly, there is no debate about that.
The proponents of man caused change are in for surprise.
The temperature of earth is controlled by the Sun as we are about to experience.
Sunspots are decreasing.
They are basically at zero now: 
and it won't make much difference for a while. Might start to see effects in a decade or two if the cycles continue their downward trend. A very large volcanic explosion would also make a difference. In those cases we will be very lucky not to have summer frosts and crop losses.