the 50-year window to get humanity off Earth

He gives humanity about 50 years, then offers to buy it a billion

Threats 'far beyond' climate, a 'fundamentally good goal' of leaving Earth, and a plan he says keeps the planet habitable for a billion years.

the deadline is the product — if civilization has fifty years then every rocket, permit and power plant is urgent, and objecting to any of it is objecting to survival.

new — four outlets ran the Mars sermon