How do you approach themes of climate change and food insecurity and societal collapse without overly burdening your child's childhood?

When my kid was 3, I explained that fossil fuels were polluting earth, but wind and solar energy would help. And using less. When they were 4 we visited ecovillages and planned to move to one, but my co-parent moved back to city and our shared custody agreement, and inability to agree on rural place to live, has left us city-bound last 7 years.

Now they're 10. Also diagnosed with autism, with symptoms depression and anxiety. I've been casually mentioning fact that some fruits and grains will no longer be around when they're old, due to changing climate, which stressed them out. This year I've taken them backcountry camping, taken them on 16 mile bike rides, we do urban foraging and backyard gardening.

As things worsen, it's hard for me to put on casual or hopeful outlook. I want to take them to rural area and intensive farm and build community. I don't want them to come of age in city as SHTF.

But I sound depressing and conspiracy minded when I talk to my adult friends about this topic and was wondering how other parents are handling this. Any documentaries or books or conversation tips?