But I'm hyper-aware of how my situation is utterly different from billions of humans on this planet, with little or no access to even a tree. Or opportunity to sit under it. Living in high-rise apartment blocks far, far from these imagined opportunities.
The world out there is more like blade runner, than a utopia, for the vast majority of people.
The mind is a powerful tool and if people believe they can use it to reconnect, they're much more likely to find a way to. When it comes to subjective experiences, it's important to engage cognitive biases in the direction we want them to go. Beliefs are useful for that, so we need to choose them wisely. Telling people they're not capable of accomplishing things is only helpful if they're rebelling against you because then they'll take it as a challenge. For others who are already in a disempowered state, they could use your message as reinforcing their stuck perspective. I choose to view life in such a way as to promote change and well-being, not get me or anyone else who hears my perspective stuck in it.
If you want to reconnect with nature, you can. You sound like you don't want to believe it's possible, but even the smallest amount of effort can make a load of difference. Have you done any googling to challenge your belief? Have you sought out free ways to reconnect with nature?