As unlikely as it seems, I think humanity will realise the enormity of climate change and work together to fix it. ‘If men define situations as real, they are real in their consequences.’ – William Thomas (1928). This is a rule in sociology that is still as relevant today as in ‘28. If people believe the worst will happen, then they become much less likely to try to prevent it.
So really it’s everyone’s responsibility to be optimistic about the future. You might just be saving your own life.