It is more than possible that San Francisco would look like that. Let me explain:
1000 years, right?
1) Well, Earth has a wobble axial rotation:
That rotation changes the climate around different parts of the globe, with the full wobble rotation estimated to be 26,000 years.
That happens when you are far from the sun during northern summer (winter in the south) and closer to the sun during northern winter (summer in the south, Aussies know that). Due to un
Although that should mean the Tropic of Capricon should be the line of death, when in reality it has the most of rainforests compared to the Tropic of Cancer. I think that's due to less dry land and more sea and ice there compared to the northern hemisphere which means lots of mist to cool down.
Sure, we're warming now. But will this continue, or will natural factors change things?
www.forbes.com
This could make desert places tropical rainforest again, and vice versa, could as well make San Francisco more "tropical" than it is, but not necessarily.
2) Invasive plants say hi:
With many gardens and even homes having exotic plants and trees from all over the world you should expect those to compete with native plants and trees as well. Here is an invasive plant called "Wild Balsam" (
Impatiens balsamina) literally invaded our mountains and turn the mountains into pink during late August and September after the monsoon season:
Yup, that's fucking me ~11 years ago:
We've had many other plants that root from all over the globe. Funnily, there are plants that came from the Americas and now are in the wild. So you can imagine how it's possible to have mixed nature after 1,000 years when people lose control over those gardens.
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Anyway, I hope that entertained some. This is one massive reason why I loved Horizon Zero Dawn and went reading everything because this futuristic stuff entertains me a lot and makes me read every collectable in the map to learn more. Horizon is a very unique game and experience to me, just like The Division that people spent their time shitting on I was more interested in the political background on why the US and Russian governments are keeping the smallpox virus in their labs even with all the WHO calls to terminate them as it's an extinct virus in the wild since 1979.
en.wikipedia.org
And how such divisions exist for various reasons in real life. Interesting stuff.