Were I to have a step-daughter, I would apologize for nothing. I've gone without a car in cities that were designed for nothing but. I recycled when the waste company charged for the privilege. Etc., etc., you get the point. I continue to reduce my carbon footprint as best I know how to this day, and will continue to do so in the future. Have I chosen the most effective means? Nope, not always; probably not even most of the time. Sometimes I miss the forest for the trees, and sometimes I just make bad choices based on bad information. But I keep at it.

Live a life that requires no apology, starting today. Too little, too late? I don't know, not much I can do about that. But what I can do is live a life less impactful on the environment, which is what I ought to be doing climate change or not. Perhaps climate change is your personal wake up call to dial back on the life of consumerism. Maybe it's a call to examine some other aspect of your life, I dunno. Regardless, it is an opportunity for examination, and answering the question of your place in the your environment and your impact on it. The rest of it will take care of itself, one way or another.