Your waybackmachine archive link? That page is the opposite of convincing. Half the examples are "climate scientists human, news at 11", another quarter don't say what the framing claims they do (unless further context shifts their meaning—but that's not provided, what is provided does not say what the framing claims it does) which makes me really wary of the remaining 1/4 or so (strongly suspect their meaning shifts to be rather less nefarious as one expands context).
They appear to be all over Scribd, but I'm not convinced it's worth creating an account to see more than the first page. The case for there being anything worth reading doesn't look strong. You seem to feel otherwise, though, so go for it. First page of DDG with naïve search terms, multiple results. Or, here:
Can't verify it's unaltered (how would I?) but it's 261 pages and the first page reads like it's raw emails. That seems like a plausible length for ~1000 emails, assuming quite a few are very short. Not sure if it's organized so that it's easy to follow email chains.
Climate change skeptics seem to share around some other PDFs, but they're all heavily edited and contain only a small part of the total set of stolen data, often not even very many complete emails, just parts of them, as far as I can find. They seem to have no trouble getting access to them and are keen to share excerpts, which appear to survive just fine—reddit, internet archive, their PDFs are everywhere—but not the whole thing.
And that's a good source for this?