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Keep it very simple at first. It's common (but maybe not natural ;) ) to think linearly. If x changes then y changes proportionally. (y=mx+b)
But that's a simplified version of reality.
Maybe using ideas like: If I go for a walk in the forest, the forest affects me. It makes me feel calm, I can see the beauty, etc. But I also affect the forest. When I am there, fewer animals are in my vicinity. I leave foot prints, and maybe eat berries so that there are fewer for the animals.
I think starting with this give and take sort of idea can provide a foundation.
It's just a small step to: the system influences my behaviour and I influence the system through "these" real things.
I've always found (in my experience teaching first year uni science students) teaching something directly, especially if it goes against someone's fundamental understanding, is not very fruitful.
So saying "we are a product of the world we live in" might help, but usually isn't too effective.
If you ask probing questions that lead to the person discovering reality themselves, that is a lasting impression. Trust that people are smart and capable. Even if they do dumb things (we all do).
Example would be asking someone what causes the seasons on Earth, and getting them to reason it out. Albeit, a non-political question is easier, the same tactics can be used for anything really.