Man has been tracking solar activity for a long time – the ancient Chinese were bang on the case. And so we have 5,000 years of fairly accurate records of solar sunspots.
Using samples drawn from ice cores we can assemble 5,000 years of records for C02 levels in the atmosphere. And trees etc allow us to do the same for temperature.
Now look at this chart below. It tracks solar sunspots versus global temperature. As you can see there is a fairly good correlation.
The temperatures measures cover the US land mass so that is a big enough sample to be credible.
There is no chart that shows any correlation between C02 levels and global climate. Hence the inconvenient truth of the medieval warm period (1100 to 1400) and the mini ice age of 1700 (which was a global phenomenon, not just a European one).
On the basis of the one chart that does show a correlation and the other which does not, can anyone please explain why it is deemed so illogical to doubt the assertion that man made carbon emissions cause climate change? Over to you global warming nutters…