Salvador
RF's Swedenborgian
Even with Musk's unproven optimistic estimates, it doesn't look even remotely cost
effective for carbon sequestration on Mars (something I was specifically addressing).
I'm highly skeptical of the notion that we'll terraform Mars, & make an independently
survivable alternative to Earth. It would need a fully functioning advanced technological
society. That's a big thing to do.
I prefer solutions close to home (Earth) for accessibility.
Carbon sequestration would be something done to cool a planet such as Venus, and this would be too expensive a process to do for terraforming Venus.. However, adding super green house gases to the Martian atmosphere for making Mars a warmer planet, would be far less expensive a process than carbon sequestration. I also think Elon Musk is too much the optimist. My $1,000-$2,000/kg delivery cost of sending CF6 to Mars, is 5-10 times greater than his perhaps overly optimistic $200/kg delivery cost estimate.
Wow though, if Elon Musk is right about the future costs of space travel, then Mars terraforming could be effectively done in a way shorter time span than the 10,000 years I'd envisioned and a far lesser cost than the $500 billion per year I'd estimated.