Absolutely staggering. I wish they knew that they'd have made such a long-lasting impression on the Earth.
Much of what we think of as natural landscape was made by man.
Even that which is patently unnatural passes without much consideration- the neighbouring farm sits smack atop a Roman fort (situated on an inconvenient hilltop between a known fort on the conwy river and a known fort atop a mountain, which has a view to the sea on one side and our hill, but not the river, on the other) - and my garden atop a Roman road - and nobody knows. The dead giveaway was when we took the mouldering plaster (gypsum atop lime) off the internal walls of the house, to find dressed masonry, and one slab with part of a funerary inscription upon it - the cottage was built from spoilage from the road and tombs that lined it - 400 years ago they would have just been some handily squared off chunks of stone, ideal to build with.
> ”as the trees were felled thousands of years ago”
Might you have a source on this you could share? I was under the impression that at least the majority of the deforestation happened in recent centuries or even decades, rather than thousands of years.
I did a quick google and didn’t immediately find much detail, although this  article from the Independant claims “half of its ancient woodland lost since the 1930s” talking about Britain as a whole.
Maybe it happened much earlier in North Wales?
Anyway, wherever the line is between natural and man-made, I still really love Snowdonia - was there most recently two months ago (staying quite near you as it happens, a few miles inland from Conwy), it’s such a nice place to get away from city life for a little.
There’s a guy who has been campaigning / writing a lot about this subject (I think specifically about the Lake District but might be wrong) pushing for more tree planting, but I can’t think of the name right now... Edit: George Monbiot. I don’t have time right now to revisit his writing but just remember he’s interesting on the topic.
That claim about half of ancient woodland lost since the 1930s : that's true, but it's referring to what ancient woodland still remained in the 1930s compared to what remains now. Both are very small areas, compared to the amount of land which became forested after the last ice age.
A quick reference I've found; wikipedia (https://en.wikipedia.org/wiki/Blanket_bog) has "In some areas of Europe, the spread of blanket bogs is traced to deforestation by prehistoric cultures.", cited to an article in Nature: Moore, P. D. (1973). The influence of prehistoric cultures upon the initiation and spread of blanket bog in upland Wales. Nature, 241, 350–353.
We have similar in Ireland, blanket bogs here were essentially man made.
Genuinely surprised me when I first read about it.
Perhaps it was burned down as part of an early Viking raid (there were notable battles against the Vikings in the area) - who knows?
Edit: Stuff like that is one of the reasons I love living in the UK - the hill behind the house where I currently live has a staggering amount of history - from a Roman camp of Agricola, to a dark age fort, to medieval stuff, 19th century industry and 20th century wars. And that's one small fairly unexceptional hill.....
The first people to arrive in New Zealand, the Maori, arrived c. 1300 CE. New Zealand was the last major land mass to be settled by humans apart from Antarctica.
In 700 years, humans managed to destroy 2/3 of New Zealand's forest cover and drive to extinction the largest bird in existence (at the time) and also the largest eagle in existence: https://en.wikipedia.org/wiki/List_of_New_Zealand_animals_ex...
They could build to last in the stone age, and there's no reason to believe that they would be surprised that their monuments are still standing today...
When it comes to the latent evidence of human occupation, I guess it's a bit more unexpected for it to become so visible to us. But even stone age cooking fires leave very permanent traces. https://en.wikipedia.org/wiki/Fulacht_fiadh
What is nice is that the article mentions the rain shortage, which is a nice way to compare.
Plus, even if not technically a heatwave, we'd still call it one as laypeople. We are built to withstand the cold and wet (buildings, wardrobes, etc). It becomes extremely uncomfortable in hot weather no matter how much we like to moan about shite weather.
 "Three fine days and a thunderstorm"
Can you elaborate on this?