This is an unpopular question, where people assume things about me, but by what mechanism would the human species be ruined? It seems that would require that all innovation towards climate mitigations stops, when it hasn't really even started yet. Reversing climate change probably isn't going to happen, but mitigation is still on the table, from routing fresh water from wetter northern climates to desalinization plants [1] to sun shading [2].

[1] Desalinization, where 300 million are currently services: https://www.usgs.gov/special-topics/water-science-school/sci...

[2] Block 2% to reduce warming by 1.5C. https://www.carbonbrief.org/explainer-six-ideas-to-limit-glo...