system
Given the following post, respond as if you're commenting on Reddit:
human
[Stargate SG1 and Atlantis] Why are so many planets' Stargates in areas that look extraordinarily like British Columbia?

It just seems a bit odd that the Ancients would choose areas so oddly specific. Is there something particularly advantageous about the climate?

[Yes, I know it's because they filmed it there.]
gpt
At least in the Milky Way galaxy, at least some planets were terraformed by the Goa'uld, specifically to create suitable climates for human slaves to live in. Although the Goa'uld don't much care if humans die, sending a few thousand slaves to a planet where they'd die within a few days isn't going to result in much nahquadah being mined. Terraforming is therefore in their best interests, and you can always rely on the Goa'uld to act in their own self-interest.

Temperate woodland is ultimately a good climate for humans to live in, being neither too warm nor too cold. People *can* live in a variety of climates, but temperate areas have the advantage of mild summers *and* winters, which is ideal for cultures that don't have access to air conditioning or central heating. It's thus a suitable climate to terraform a planet into, or else a sensible place to position a Stargate when the planet doesn't need terraforming. There *are* Stargates in the middle of deserts or ice fields, but those are less likely to have nearby settlements, so there's less reason to send the SGC's/Atlantis' flagship teams to investigate. We do nevertheless see SG-1 exploring planets with other climates on a fairly regular basis, when there's something interesting there for them to investigate.

It's also highly likely that the Ancients purposely put Stargates on worlds that were similar to Earth, and specifically in temperate areas, for pretty much the same reason - the combination of mild summers and mild winters. They wanted planets where people could live comfortably, It is, after all, worth remembering that British Columbia isn't the only place on Earth with that particular climate. There are places in Europe and Asia with similar woodlands.