>A reference would increase confidence in these assertions.
The one and only Tony Heller: https://realclimatescience.com/2021/06/yes-climate-change-ma...
>Solar activity hasn’t been increasing massively over the last century, whilst average temperatures did.
Not really. The earth has been gently cooling down since the 1930s. The US has the best temperature records which is why it's the most useful to study.