• Best pronounced with an accent from southern Scotland or the north of England: "Where there's muck, there's money." There's a history to environmental degradation for profit, and checking out old arguments can be useful to avoid accusations of bias in current arguments.
• "Posterity don't vote (and neither do most young people)."
Encourage them young folk to register to vote and get involved in boring elective politics. And remind old folks they might want to leave a livable world to their grandkids and/or avoid ending up Soylent Grey™ in their last days. On which subject, or part thereof ...
• "Let em all go to hell, / Except Cave Seventy-Six!" — First national anthem, according to Mel Brooks's 2000-year old man. It's preferable to "Hurray for me; and piss on you all," but on a global issue a global-size "circle of concern" is a good idea. Global disasters will take Cave 76 with them.
• "Know how to answer an Epicurean": Talmudic advice meaning a theistic Jew should learn how to argue with a materialist. Similarly, atheists should learn how (when and if) to argue with theists and even Fundamentalists.You don't have to agree on fundamentals to come to some practical conclusions and work together. (Variation from 1969, The Left Hand of Darkness: ""We can pull a sledge together without being kemmerings" [§6] — we don't have to have a bonded, long-term, loving relationship with people [or even like them] to cooperate on specific projects.)
• "Rhetoric: The Art of Ethical Persuasion": That's *persuasion*, getting people to do what you want them to do (and which they should do: that "ethical" part). Winning the argument and/or getting Truth is for philosophy. So let it go with "global warming" and "severe climate change" and drop insisting on "anthropogenic" if it'll get turn the discussion n from survival strategies to the deep causes of the phenomena and/or will have you come across in another in a long line of elitist puritans trying to shame people. Earth is heating up; this is a long-term trend; it's dangerous — What can and should we do about it? Cutting down carbon emissions is one obvious thing, especially advisable since we should be doing it anyway (our descendants might want some handy hydrocarbons of their own and may be very pissed off to learn, "You freaking burned it?!" See above on Soylent Grey™.