The scenarios for humanity are quite grim if climate change isn't addressed in a major coordinated effort in the next few years.
Water scarcity, the death of _all_ coral reefs, sea-level cities everywhere being flooded, massive species die-offs (including ones crucial to human survival, like pollinating insects), oceanic fisheries collapse. . . with more severe scenarios seeing the Middle East, North Africa, and parts of South Asia becoming uninhabitable.
Avoiding this scenario is going require every intervention, large and small, that humanity can muster. This is serious stuff. There's a reason that climatologists sound like doomsday prophets these days.
And part of any successful effort is combating the selfishness and denial of the average person. So pardon me if I'm somewhat unsympathetic to your attitude of self-interested helplessness - "Drive a truck. Enjoy your life. It's too short to matter in the long run." We're literally concerned with the fates of hundreds of millions of human beings here.