Perhaps, but it's already getting to the point of "too little, too late" as far as convincing people climate change exists, not to mention our current infrastructure is heavily invested in ignoring climate change. So continuing on our current course is bad, yes, but deviating at this point will only delay the inevitable. There are a number of cascading changes set in motion already.
And while I don't think humanity will be extincted by climate change, we'll certainly get our "hair mussed." As in, large amounts of drought/flood displacing millions of people into already crowded areas that don't have the infrastructure to support the influx...meaning plagues, food/water shortages, etc.
And to say, "technology will find a way to fix it!" is the bigger fallacy. We should be ready for a nice big shitstorm 50-100 years from now that no amount of scientists or computers can fix. After all, as much as we like to think of ourselves as little gods, we're really just apes with shiny toys. We've made it this far, but when you think about it, we've been through one ice age, a handful of plagues, and zero mass-extinctions. Not a big list. We're a blip on the geological radar, and we can disappear as fast as we came. We need to remember this.
