I know this may not be the answer you were looking for, but I feel like maybe it might be more useful: Focus on your end goal. What do you want to have happen at the end of this conversation? What is the purpose of all of giving them this information? I'm assuming you are having this conversation for a reason as in there is some specific outcome you want them to achieve or action you want them to take. If this conversation is coming down to, "Hey, look how fucked we are!" then it's probably not going to turn our like you'd want, because you are bringing a problem to the table, not a solution.

But if this conversation is, "I'd like to invest the time, energy, and money into turning this plot of land into a permaculture farm and I need your help," then the more convincing argument isn't going to be about decreasing returns on global investment in energy extraction, rising sea-surface temperatures, an increase in extreme weather events, and melting glaciers in the Andes. Instead focus on what the particulars or your plan are and what specifically you are asking of them. You don't need to go into the why and do an hour long powerpoint presentation on James Hansen's research over the last 50 years, but you do need to connect your vision with their lives. If they are worried that everything is getting crazier in the world, then your objective is to give them a sense of security, and here's how your vision will achieve that. If they value independence, lean into their experience from the COVID pandemic supply chain and energy shocks that resulted from that and the invasion of Ukraine which led to inflation and goods disappearing from shelves. If they value a connection to the environment, build up that idea of creating a flourishing ecosystem that nourishes you, your family, and the local ecosystem and that even if you can't change the world you can do this one thing in this one place for you and yours to make a difference in your own lives. If they are more entrepreneurial, sell them on it as an investment in the future due to placing most costs upfront whereas inflation will continue making food more expensive into the future, and that the excess that can't be used or stored could be sold in a farmer's market or an online marketplace. Tailor your evidence to the argument you are making and tailor your argument to what you are asking of them.

So just to reiterate, give them a vision, give them an outline of the plan, connect that vision to their own lives and values, explain how this idea will benefit them, then give them the ask. You don't need to sell them on the impending collapse of global civilization, you can have those conversations while planting blueberry bushes on your new permaculture farm, but you do need them to take a chance on your leadership in this idea.

And that's the real subtext here. You're selling your ability to lead them though with this vision to a better tomorrow, because this is your idea, your vision, your baby, and you have to own it. If you can't convince them of that, then they aren't going to take the chance on you. If you can't be confident in how this is all going to work and be able to address their questions, issues, and reservations, they won't follow your lead. If you can't take this on, or you can't take the lead, then there's your ask: having someone else carry your vision... and that's a big ask.