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Do you remember when Sun Chips changed their chip bag material to a more environmentally friendly compostable material? People lost their minds. Why? Because the bag crinkled a lot. All of the boring late night talk shows made fun of Sun Chips bags. So, they switched it back to the old bags.
Moral of the story is that people don't care if something is better for the environment if it inconveniences them now. If everything was in cans people would cry because they can't close them or whatever. In fact, many items that were previously sold in cans are now plastic. Also, money... Cheaper to wrap water in plastic.
You can still buy Coca-cola in glass bottles if you look hard enough. But they are pricey.
If he's a "hard follower" of Joe Rogan than he likely won't be interested in other content. Rogan is a fool, but that's why people find him appealing. Content that is insightful and educational is the opposite of the junk food of Rogan.
Maybe instead, when Rogan says something like "Bro did you know like the pineal gland of the chimpanzee produces anti-covid hormones? This is just what I've heard. Look it up. By the way did you see the tree growing in my toilet?" You can help your sibling by teaching them ways to think, reason, and critically evaluate the BS that freely flows from the Roganverse.