I think you're probably just projecting your own anxieties onto teens. It's been a while since I've been in touch with my teenage side, but what I remember people being stressed about was school work, family issues, bad dating experiences, bullying and all around bad social experiences, etc. The people who actually paid attention to politics were usually smart and well-adjusted.
As a side note, your list seems highly exaggerated. I understand climate change is serious, but where is anyone saying it will be unlivable within decades?
> Climate change is causing distress, anger and other negative emotions in children and young people worldwide, a survey of thousands of 16- to 25-year-olds has found.
> The results, released in a preprint on 14 September1, found that most respondents were concerned about climate change, with nearly 60% saying they felt ‘very worried’ or ‘extremely worried’. Many associated negative emotions with climate change — the most commonly chosen were ‘sad’, ‘afraid’, ‘anxious’, ‘angry’ and ‘powerless’ (see ‘Climate anxiety’). Overall, 45% of participants said their feelings about climate change impacted their daily lives.
As a side note, your list seems highly exaggerated. I understand climate change is serious, but where is anyone saying it will be unlivable within decades?