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It's not a conspiracy or some grand revelation.
They didn't need it before. Much of America didn't either. A lot of old wood houses had designs built for airflow and trees surrounding the houses. Those that didn't got old attic fans that would pull air from the bottom of the house to the top and out of vents.
These days, insulation and HVAC exists and Americans jumped at the chance to have year round temperature control. Heat pumps now have the best efficiency for cooling and heating year round and can replace most options. Almost everyone will need this option as global warming barrell out of control.
I hate it when people chop down all of the trees around their house, I assume because they don't want the leaves on their yard. I have a bunch of trees around my house, the downside is it is sort of dark in the house and it is hard to have a garden, the plus side is it must be at least 10 degrees cooler inside in the summer. I've left the house overdressed thinking it is a cool day because of it.
You'd have to have an extremely drafty house for them to pull air from the bottom of the house and your attic floor should be well insulated anyway. The recirculating air is coming from the soffits and vents. The best reason to have an attic fan is if you have an AC unit in the attic, then you want to get hot air out of that space.
If you live far from the cities, then cutting down the trees immediately close to your house can be a very reasonable thing to do (some countries even mandate it), because if a wildfire comes around, it is more likely your house will survive if it isn't surrounded by flammable materials.
Tell me you live in California without telling me you live in California.
(Or maybe elsewhere in the west, or maybe Australia or something -- the point is, it's not a rural thing, it's a rural + arid climate thing.)
Many non-arid Canadian provinces are on fire now. This guidance is given to anyone in a rural area in Vancouver, Alberta, Ontario, Quebec, and NWT.