Energy production is slowly moving towards being a solved problem, with emissions going down - thanks to renewables, not nuclear. Mobility's co2 contributions are still increasing, and in particular flying doesn't seem to have feasible solutions in any reasonable time frame. Yes it's not a low hanging fruit in terms of reducing emissions, but it's a hard nut - and the global effects of it are increasing (and already larger than 2% due to radiative forcing). Incidentally it's also a way in which individuals can blow their individual carbon budget very quickly, and thus can also mitigate it very easily.

Carbon sequestration is not a low hanging fruit, arguably it's even less feasible, less economical at the scale required than fossil-free aviation.

I think young people's gloom is reasonable when constantly being confronted with climate change deniers, and even those who believe reality will fight tooth and nail against changing the economy towards being more sustainable, citing magical, non-existing or uneconomical technologies that would allow everybody to just continue like today. It's frustrating to talk to people who don't want to make small adjustments today, willingly accepting that everybody has to make larger and more radical changes later as society keeps kicking down the can.