Republicans say Facebook and Twitter censor conservative opinion. Democrats say Big Tech is a monopoly. So, conservatives cheered Elon Musk’s offer to buy Twitter, a move they claimed could break progessives’ hold over social media. For their part, liberals worried that a single individual could hold so much power over online speech.Yet Musk’s on-again, off-again deal has me thinking about, of all things, trees and air.The medium that carries newspapers, magazines and books is paper — which comes from trees, a renewable resource.