Do you think that having a monopoly on some invention will prevent widespread usage of that invention? Like, "yeah, we invented fully clean carbonless way of making energy for 1% of current prices, but no one will have it"? Currently it just means that the creator of widely usable technology will have some percentage of money for others using his invention instead of others making all the money from his invention while he has a pat on the back.

semiconductor without clean power is not going to impact climate change that much

for compelling emergencies states can already waive patents, so the relevant mechanisms are already in place if anything momentous happens.

Yeah, the pandemic where rich countries had developed economies capable of producing such vaccines, which they then donated massively to poorer countries [1] or sold to other countries at reduced price. If these companies did not exist, or if they had no profit motive, no one would have had vaccines.

[1] https://ourworldindata.org/grapher/covax-donations