Honestly, kurzgesagt is techno optimistic and longtermism and so is that video. That's not solarpunk. But take it from a long but worth it video essay.
Techno-optimism means thinking that a technological solution will fix our issues. As solarpunks we, for example, are critical of a lot of tech uses and a lot of incentives that do not allow the best tech to emerge just by being “better tech” like a tech optimist would think. Check out Californian ideology stuff.
About longtermism: basically it’s caring less about the suffering of today thinking about working towards better condition for the people of tomorrow. In a stupid simple way: giving 10€ to research for fusion instead of using them to feed a child for one month because people will suffer anyway and the faster we arrive at the fusion the less people will suffer.
That said, I don’t think kurzgesagt is that much tech optimist, it’s just a channel that focuses on harder sciences so it’s easier to focus on “can this technology work” more than “can this policy work”
I think there is some overlap. Solarpunk is a bit more grounded in simple solutions that are needed now but long term I think we have somewhat similar goals.
Technically, I think solarpunk is both optimistic about technology and concerned with long-term issues, just not to the illogical extreme of some members of those movements.
For me, Longtermism doesn't just mean thinking about long term consequences but it implies not caring about today's problems like climate change and poverty because the needs of the future generations outweigh the needs of our generation. I come from a perspective of "building the new in the shell of the old" and achieving long terms goals that way which is the opposite of Longtermism.
Thank you, TTT's video was what i thought of.
Worth mentioning for anyone wondering why, that green growth is not compatible with solarpunk, because solarpunk has a large intersection with degrowth.